667720930 has 8 divisors (see below), whose sum is σ = 1201897692. Its totient is φ = 267088368.

The previous prime is 667720927. The next prime is 667721011. The reversal of 667720930 is 39027766.

It can be written as a sum of positive squares in 2 ways, for example, as 605799769 + 61921161 = 24613^2 + 7869^2 .

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

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, 33386037 + ... + 33386056.

Almost surely, 2^667720930 is an apocalyptic number.

667720930 is a deficient number, since it is larger than the sum of its proper divisors (534176762).

667720930 is a wasteful number, since it uses less digits than its factorization.

667720930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66772100.

The product of its (nonzero) digits is 95256, while the sum is 40.

The square root of 667720930 is about 25840.2966314243. The cubic root of 667720930 is about 874.0407141358.

The spelling of 667720930 in words is "six hundred sixty-seven million, seven hundred twenty thousand, nine hundred thirty".