680193657 has 24 divisors (see below), whose sum is σ = 1154270208. Its totient is φ = 380527200.

The previous prime is 680193653. The next prime is 680193659. The reversal of 680193657 is 756391086.

It is a happy number.

It is not a de Polignac number, because 680193657 - 2² = 680193653 is a prime.

It is a super-2 number, since 2×680193657² = 925326822046067298, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (680193653) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 262969 + ... + 265542.

It is an arithmetic number, because the mean of its divisors is an integer number (48094592).

Almost surely, 2^680193657 is an apocalyptic number.

It is an amenable number.

680193657 is a deficient number, since it is larger than the sum of its proper divisors (474076551).

680193657 is a wasteful number, since it uses less digits than its factorization.

680193657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 528541 (or 528538 counting only the distinct ones).

The product of its (nonzero) digits is 272160, while the sum is 45.

The square root of 680193657 is about 26080.5225599488. The cubic root of 680193657 is about 879.4494046303.

The spelling of 680193657 in words is "six hundred eighty million, one hundred ninety-three thousand, six hundred fifty-seven".