64904895 has 80 divisors (see below), whose sum is σ = 134548128. Its totient is φ = 29583360.

The previous prime is 64904891. The next prime is 64904909. The reversal of 64904895 is 59840946.

It is a happy number.

It is not a de Polignac number, because 64904895 - 2² = 64904891 is a prime.

It is a super-2 number, since 2×64904895² = 8425290789922050, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 64904895.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64904891) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 75307 + ... + 76163.

Almost surely, 2^64904895 is an apocalyptic number.

64904895 is an abundant number, since it is smaller than the sum of its proper divisors (69643233).

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

64904895 is a wasteful number, since it uses less digits than its factorization.

64904895 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 902 (or 893 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 45.

The square root of 64904895 is about 8056.3574275227. The cubic root of 64904895 is about 401.8763821286.

The spelling of 64904895 in words is "sixty-four million, nine hundred four thousand, eight hundred ninety-five".