667728698 has 32 divisors (see below), whose sum is σ = 1248360960. Its totient is φ = 260807040.

The previous prime is 667728667. The next prime is 667728727. The reversal of 667728698 is 896827766.

It is a super-2 number, since 2×667728698² = 891723228265550408, which contains 22 as substring.

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, 8843 + ... + 37598.

It is an arithmetic number, because the mean of its divisors is an integer number (39011280).

Almost surely, 2^667728698 is an apocalyptic number.

667728698 is a deficient number, since it is larger than the sum of its proper divisors (580632262).

667728698 is a wasteful number, since it uses less digits than its factorization.

667728698 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46542.

The product of its digits is 12192768, while the sum is 59.

The square root of 667728698 is about 25840.4469388592. The cubic root of 667728698 is about 874.0441035368.

The spelling of 667728698 in words is "six hundred sixty-seven million, seven hundred twenty-eight thousand, six hundred ninety-eight".