64646505 has 96 divisors (see below), whose sum is σ = 145087488. Its totient is φ = 26827200.

The previous prime is 64646497. The next prime is 64646507. The reversal of 64646505 is 50564646.

It is a happy number.

64646505 is a `hidden beast` number, since 6 + 4 + 646 + 5 + 0 + 5 = 666.

It is not a de Polignac number, because 64646505 - 2³ = 64646497 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 64646505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64646507) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 93210 + ... + 93900.

It is an arithmetic number, because the mean of its divisors is an integer number (1511328).

Almost surely, 2^64646505 is an apocalyptic number.

It is an amenable number.

64646505 is an abundant number, since it is smaller than the sum of its proper divisors (80440983).

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

64646505 is a wasteful number, since it uses less digits than its factorization.

64646505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 729 (or 717 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 36.

The square root of 64646505 is about 8040.3050315271. The cubic root of 64646505 is about 401.3423754476.

The spelling of 64646505 in words is "sixty-four million, six hundred forty-six thousand, five hundred five".