64653780 has 24 divisors (see below), whose sum is σ = 181030752. Its totient is φ = 17240992.

The previous prime is 64653779. The next prime is 64653781. The reversal of 64653780 is 8735646.

It is an interprime number because it is at equal distance from previous prime (64653779) and next prime (64653781).

It is a super-2 number, since 2×64653780² = 8360222536576800, which contains 22 as substring.

It is a hoax number, since the sum of its digits (39) 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 (64653781) 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, 538722 + ... + 538841.

It is an arithmetic number, because the mean of its divisors is an integer number (7542948).

Almost surely, 2^64653780 is an apocalyptic number.

64653780 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

64653780 is an abundant number, since it is smaller than the sum of its proper divisors (116376972).

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

64653780 is a wasteful number, since it uses less digits than its factorization.

64653780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1077575 (or 1077573 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 39.

The square root of 64653780 is about 8040.7574270090. The cubic root of 64653780 is about 401.3574299158.

The spelling of 64653780 in words is "sixty-four million, six hundred fifty-three thousand, seven hundred eighty".