64911906 has 24 divisors (see below), whose sum is σ = 141059100. Its totient is φ = 21573216.

The previous prime is 64911901. The next prime is 64911907. The reversal of 64911906 is 60911946.

64911906 is a `hidden beast` number, since 649 + 1 + 1 + 9 + 0 + 6 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 61074225 + 3837681 = 7815^2 + 1959^2 .

It is not an unprimeable number, because it can be changed into a prime (64911901) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1116 + ... + 11448.

Almost surely, 2^64911906 is an apocalyptic number.

64911906 is an abundant number, since it is smaller than the sum of its proper divisors (76147194).

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

64911906 is a wasteful number, since it uses less digits than its factorization.

64911906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10690 (or 10687 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 36.

The square root of 64911906 is about 8056.7925379769. The cubic root of 64911906 is about 401.8908517814.

The spelling of 64911906 in words is "sixty-four million, nine hundred eleven thousand, nine hundred six".