164477772 has 18 divisors (see below), whose sum is σ = 415763348. Its totient is φ = 54825912.

The previous prime is 164477749. The next prime is 164477779. The reversal of 164477772 is 277774461.

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

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (164477779) 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, 2284378 + ... + 2284449.

Almost surely, 2^164477772 is an apocalyptic number.

164477772 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

164477772 is an abundant number, since it is smaller than the sum of its proper divisors (251285576).

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

164477772 is a wasteful number, since it uses less digits than its factorization.

164477772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4568837 (or 4568832 counting only the distinct ones).

The product of its digits is 460992, while the sum is 45.

The square root of 164477772 is about 12824.8887714475. Note that the first 3 decimals coincide. The cubic root of 164477772 is about 547.9013932725.

The spelling of 164477772 in words is "one hundred sixty-four million, four hundred seventy-seven thousand, seven hundred seventy-two".