64919172 has 12 divisors (see below), whose sum is σ = 151478096. Its totient is φ = 21639720.

The previous prime is 64919167. The next prime is 64919213. The reversal of 64919172 is 27191946.

It is a tau number, because it is divible by the number of its divisors (12).

It is a self number, because there is not a number n which added to its sum of digits gives 64919172.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2704954 + ... + 2704977.

Almost surely, 2^64919172 is an apocalyptic number.

It is an amenable number.

64919172 is an abundant number, since it is smaller than the sum of its proper divisors (86558924).

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

64919172 is a wasteful number, since it uses less digits than its factorization.

64919172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5409938 (or 5409936 counting only the distinct ones).

The product of its digits is 27216, while the sum is 39.

The square root of 64919172 is about 8057.2434492201. The cubic root of 64919172 is about 401.9058466164.

The spelling of 64919172 in words is "sixty-four million, nine hundred nineteen thousand, one hundred seventy-two".