64939810 has 64 divisors (see below), whose sum is σ = 135136512. Its totient is φ = 22277376.

The previous prime is 64939801. The next prime is 64939811. The reversal of 64939810 is 1893946.

It is a super-2 number, since 2×64939810² = 8434357845672200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (64939811) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 110337 + ... + 110923.

It is an arithmetic number, because the mean of its divisors is an integer number (2111508).

Almost surely, 2^64939810 is an apocalyptic number.

64939810 is an abundant number, since it is smaller than the sum of its proper divisors (70196702).

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

64939810 is a wasteful number, since it uses less digits than its factorization.

64939810 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 667.

The product of its (nonzero) digits is 46656, while the sum is 40.

The square root of 64939810 is about 8058.5240584117. The cubic root of 64939810 is about 401.9484311299.

The spelling of 64939810 in words is "sixty-four million, nine hundred thirty-nine thousand, eight hundred ten".