164521428 has 24 divisors (see below), whose sum is σ = 385580832. Its totient is φ = 54597984.

The previous prime is 164521417. The next prime is 164521447. The reversal of 164521428 is 824125461.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27475 + ... + 32922.

It is an arithmetic number, because the mean of its divisors is an integer number (16065868).

Almost surely, 2^164521428 is an apocalyptic number.

It is an amenable number.

164521428 is an abundant number, since it is smaller than the sum of its proper divisors (221059404).

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

164521428 is a wasteful number, since it uses less digits than its factorization.

164521428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60631 (or 60629 counting only the distinct ones).

The product of its digits is 15360, while the sum is 33.

The square root of 164521428 is about 12826.5906615905. The cubic root of 164521428 is about 547.9498639909.

Adding to 164521428 its reverse (824125461), we get a palindrome (988646889).

The spelling of 164521428 in words is "one hundred sixty-four million, five hundred twenty-one thousand, four hundred twenty-eight".