667728458 has 8 divisors (see below), whose sum is σ = 1007590752. Its totient is φ = 331864876.

The previous prime is 667728409. The next prime is 667728491. The reversal of 667728458 is 854827766.

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

It is a super-2 number, since 2×667728458² = 891722587246115528, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 999260 + ... + 999927.

It is an arithmetic number, because the mean of its divisors is an integer number (125948844).

Almost surely, 2^667728458 is an apocalyptic number.

667728458 is a deficient number, since it is larger than the sum of its proper divisors (339862294).

667728458 is a wasteful number, since it uses less digits than its factorization.

667728458 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1999356.

The product of its digits is 4515840, while the sum is 53.

The square root of 667728458 is about 25840.4422949763. The cubic root of 667728458 is about 874.0439988183.

The spelling of 667728458 in words is "six hundred sixty-seven million, seven hundred twenty-eight thousand, four hundred fifty-eight".