64919660 has 36 divisors (see below), whose sum is σ = 147632688. Its totient is φ = 23969088.

The previous prime is 64919641. The next prime is 64919663. The reversal of 64919660 is 6691946.

It is not an unprimeable number, because it can be changed into a prime (64919663) 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, 6224 + ... + 12983.

It is an arithmetic number, because the mean of its divisors is an integer number (4100908).

Almost surely, 2^64919660 is an apocalyptic number.

It is an amenable number.

64919660 is an abundant number, since it is smaller than the sum of its proper divisors (82713028).

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

64919660 is a wasteful number, since it uses less digits than its factorization.

64919660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19242 (or 19227 counting only the distinct ones).

The product of its (nonzero) digits is 69984, while the sum is 41.

The square root of 64919660 is about 8057.2737324730. The cubic root of 64919660 is about 401.9068536613.

The spelling of 64919660 in words is "sixty-four million, nine hundred nineteen thousand, six hundred sixty".