667980072 has 24 divisors (see below), whose sum is σ = 1809112890. Its totient is φ = 222660000.

The previous prime is 667980043. The next prime is 667980091. The reversal of 667980072 is 270089766.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 350213796 + 317766276 = 18714^2 + 17826^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4638679 + ... + 4638822.

Almost surely, 2^667980072 is an apocalyptic number.

It is an amenable number.

667980072 is an abundant number, since it is smaller than the sum of its proper divisors (1141132818).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

667980072 is a wasteful number, since it uses less digits than its factorization.

667980072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9277513 (or 9277506 counting only the distinct ones).

The product of its (nonzero) digits is 254016, while the sum is 45.

The square root of 667980072 is about 25845.3104450304. The cubic root of 667980072 is about 874.1537710299.

The spelling of 667980072 in words is "six hundred sixty-seven million, nine hundred eighty thousand, seventy-two".