64705905 has 32 divisors (see below), whose sum is σ = 125493120. Its totient is φ = 31371840.

The previous prime is 64705843. The next prime is 64705919. The reversal of 64705905 is 50950746.

64705905 is a `hidden beast` number, since 64 + 7 + 0 + 590 + 5 = 666.

It is not a de Polignac number, because 64705905 - 2¹¹ = 64703857 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 64705905.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20302 + ... + 23271.

It is an arithmetic number, because the mean of its divisors is an integer number (3921660).

Almost surely, 2^64705905 is an apocalyptic number.

It is an amenable number.

64705905 is a deficient number, since it is larger than the sum of its proper divisors (60787215).

64705905 is a wasteful number, since it uses less digits than its factorization.

64705905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43598 (or 43592 counting only the distinct ones).

The product of its (nonzero) digits is 37800, while the sum is 36.

The square root of 64705905 is about 8043.9980730977. The cubic root of 64705905 is about 401.4652613854.

The spelling of 64705905 in words is "sixty-four million, seven hundred five thousand, nine hundred five".