64690940 has 24 divisors (see below), whose sum is σ = 137767392. Its totient is φ = 25511360.

The previous prime is 64690939. The next prime is 64690943. The reversal of 64690940 is 4909646.

It is a junction number, because it is equal to n+sod(n) for n = 64690894 and 64690903.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64690943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21359 + ... + 24198.

It is an arithmetic number, because the mean of its divisors is an integer number (5740308).

Almost surely, 2^64690940 is an apocalyptic number.

It is an amenable number.

64690940 is an abundant number, since it is smaller than the sum of its proper divisors (73076452).

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

64690940 is a wasteful number, since it uses less digits than its factorization.

64690940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45637 (or 45635 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 38.

The square root of 64690940 is about 8043.0678226657. The cubic root of 64690940 is about 401.4343090797.

The spelling of 64690940 in words is "sixty-four million, six hundred ninety thousand, nine hundred forty".