164047428 has 18 divisors (see below), whose sum is σ = 414675534. Its totient is φ = 54682464.

The previous prime is 164047421. The next prime is 164047453. The reversal of 164047428 is 824740461.

164047428 is a `hidden beast` number, since 1 + 640 + 4 + 7 + 4 + 2 + 8 = 666.

It can be written as a sum of positive squares in only one way, i.e., 163635264 + 412164 = 12792^2 + 642^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 4556873 = 164047428 / (1 + 6 + 4 + 0 + 4 + 7 + 4 + 2 + 8).

It is a junction number, because it is equal to n+sod(n) for n = 164047392 and 164047401.

It is not an unprimeable number, because it can be changed into a prime (164047421) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2278401 + ... + 2278472.

Almost surely, 2^164047428 is an apocalyptic number.

164047428 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

164047428 is an abundant number, since it is smaller than the sum of its proper divisors (250628106).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

164047428 is a wasteful number, since it uses less digits than its factorization.

164047428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4556883 (or 4556878 counting only the distinct ones).

The product of its (nonzero) digits is 43008, while the sum is 36.

The square root of 164047428 is about 12808.1000933003. The cubic root of 164047428 is about 547.4231280075.

Adding to 164047428 its reverse (824740461), we get a palindrome (988787889).

It can be divided in two parts, 16404 and 7428, that added together give a palindrome (23832).

The spelling of 164047428 in words is "one hundred sixty-four million, forty-seven thousand, four hundred twenty-eight".