66974670 has 72 divisors (see below), whose sum is σ = 202577544. Its totient is φ = 15307488.

The previous prime is 66974657. The next prime is 66974707. The reversal of 66974670 is 7647966.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 3184 + ... + 12003.

It is an arithmetic number, because the mean of its divisors is an integer number (2813577).

Almost surely, 2^66974670 is an apocalyptic number.

66974670 is an abundant number, since it is smaller than the sum of its proper divisors (135602874).

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

66974670 is a wasteful number, since it uses less digits than its factorization.

66974670 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15214 (or 15204 counting only the distinct ones).

The product of its (nonzero) digits is 381024, while the sum is 45.

The square root of 66974670 is about 8183.8053495914. The cubic root of 66974670 is about 406.1036200043.

The spelling of 66974670 in words is "sixty-six million, nine hundred seventy-four thousand, six hundred seventy".