66974990 has 8 divisors (see below), whose sum is σ = 120555000. Its totient is φ = 26789992.

The previous prime is 66974989. The next prime is 66975031. The reversal of 66974990 is 9947966.

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

It is a congruent number.

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, 3348740 + ... + 3348759.

It is an arithmetic number, because the mean of its divisors is an integer number (15069375).

Almost surely, 2^66974990 is an apocalyptic number.

66974990 is a deficient number, since it is larger than the sum of its proper divisors (53580010).

66974990 is a wasteful number, since it uses less digits than its factorization.

66974990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6697506.

The product of its (nonzero) digits is 734832, while the sum is 50.

The square root of 66974990 is about 8183.8249003751. The cubic root of 66974990 is about 406.1042667809.

The spelling of 66974990 in words is "sixty-six million, nine hundred seventy-four thousand, nine hundred ninety".