392820666647616 has 63 divisors (see below), whose sum is σ = 1125950878423813. Its totient is φ = 130940063658240.

The previous prime is 392820666647593. The next prime is 392820666647621. The reversal of 392820666647616 is 616746666028293.

The square root of 392820666647616 is 19819704.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 138083744817216 + 254736921830400 = 11750904^2 + 15960480^2 .

It is a super-2 number, since 2×392820666647616² (a number of 30 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 475259986 + ... + 476085806.

Almost surely, 2^{392820666647616} is an apocalyptic number.

392820666647616 is a gapful number since it is divisible by the number (36) formed by its first and last digit.

392820666647616 is the 19819704-th square number.

It is an amenable number.

392820666647616 is an abundant number, since it is smaller than the sum of its proper divisors (733130211776197).

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

392820666647616 is an frugal number, since it uses more digits than its factorization.

392820666647616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1651660 (or 825826 counting only the distinct ones).

The product of its (nonzero) digits is 1128701952, while the sum is 72.

The spelling of 392820666647616 in words is "three hundred ninety-two trillion, eight hundred twenty billion, six hundred sixty-six million, six hundred forty-seven thousand, six hundred sixteen".