64861958280 has 64 divisors (see below), whose sum is σ = 222383859840. Its totient is φ = 14825590272.

The previous prime is 64861958269. The next prime is 64861958299. The reversal of 64861958280 is 8285916846.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 64861958280.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38607469 + ... + 38609148.

It is an arithmetic number, because the mean of its divisors is an integer number (3474747810).

Almost surely, 2^64861958280 is an apocalyptic number.

64861958280 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

64861958280 is an abundant number, since it is smaller than the sum of its proper divisors (157521901560).

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

64861958280 is a wasteful number, since it uses less digits than its factorization.

64861958280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77216638 (or 77216634 counting only the distinct ones).

The product of its (nonzero) digits is 6635520, while the sum is 57.

The spelling of 64861958280 in words is "sixty-four billion, eight hundred sixty-one million, nine hundred fifty-eight thousand, two hundred eighty".