64688020 has 24 divisors (see below), whose sum is σ = 136025568. Its totient is φ = 25840800.

The previous prime is 64687969. The next prime is 64688021. The reversal of 64688020 is 2088646.

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64688021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17755 + ... + 21085.

It is an arithmetic number, because the mean of its divisors is an integer number (5667732).

Almost surely, 2^64688020 is an apocalyptic number.

It is an amenable number.

64688020 is an abundant number, since it is smaller than the sum of its proper divisors (71337548).

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

64688020 is a wasteful number, since it uses less digits than its factorization.

64688020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4311 (or 4309 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 34.

The square root of 64688020 is about 8042.8862978411. The cubic root of 64688020 is about 401.4282690488.

The spelling of 64688020 in words is "sixty-four million, six hundred eighty-eight thousand, twenty".