64539906 has 16 divisors (see below), whose sum is σ = 133531200. Its totient is φ = 20771408.

The previous prime is 64539889. The next prime is 64539911. The reversal of 64539906 is 60993546.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 185286 + ... + 185633.

It is an arithmetic number, because the mean of its divisors is an integer number (8345700).

Almost surely, 2^64539906 is an apocalyptic number.

64539906 is an abundant number, since it is smaller than the sum of its proper divisors (68991294).

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

64539906 is a wasteful number, since it uses less digits than its factorization.

64539906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 370953.

The product of its (nonzero) digits is 174960, while the sum is 42.

The square root of 64539906 is about 8033.6732569853. The cubic root of 64539906 is about 401.1216559466.

The spelling of 64539906 in words is "sixty-four million, five hundred thirty-nine thousand, nine hundred six".