680621871 has 8 divisors (see below), whose sum is σ = 908811904. Its totient is φ = 453089880.

The previous prime is 680621861. The next prime is 680621969. The reversal of 680621871 is 178126086.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 680621871 - 2⁶ = 680621807 is a prime.

It is a super-2 number, since 2×680621871² = 926492262567081282, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (680621831) 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, 162091 + ... + 166236.

It is an arithmetic number, because the mean of its divisors is an integer number (113601488).

Almost surely, 2^680621871 is an apocalyptic number.

680621871 is a deficient number, since it is larger than the sum of its proper divisors (228190033).

680621871 is a wasteful number, since it uses less digits than its factorization.

680621871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 329021.

The product of its (nonzero) digits is 32256, while the sum is 39.

The square root of 680621871 is about 26088.7307280366. The cubic root of 680621871 is about 879.6339175473.

The spelling of 680621871 in words is "six hundred eighty million, six hundred twenty-one thousand, eight hundred seventy-one".