64761980 has 12 divisors (see below), whose sum is σ = 136000200. Its totient is φ = 25904784.

The previous prime is 64761973. The next prime is 64761989. The reversal of 64761980 is 8916746.

It is a super-2 number, since 2×64761980² = 8388228107040800, which contains 22 as substring.

It is a hoax number, since the sum of its digits (41) 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 (64761989) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1619030 + ... + 1619069.

It is an arithmetic number, because the mean of its divisors is an integer number (11333350).

Almost surely, 2^64761980 is an apocalyptic number.

It is an amenable number.

64761980 is an abundant number, since it is smaller than the sum of its proper divisors (71238220).

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

64761980 is a wasteful number, since it uses less digits than its factorization.

64761980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3238108 (or 3238106 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 41.

The square root of 64761980 is about 8047.4828362663. The cubic root of 64761980 is about 401.5811996167.

The spelling of 64761980 in words is "sixty-four million, seven hundred sixty-one thousand, nine hundred eighty".