66874978 has 8 divisors (see below), whose sum is σ = 101809872. Its totient is φ = 32938356.

The previous prime is 66874943. The next prime is 66874979. The reversal of 66874978 is 87947866.

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

It is not an unprimeable number, because it can be changed into a prime (66874979) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 249400 + ... + 249667.

It is an arithmetic number, because the mean of its divisors is an integer number (12726234).

Almost surely, 2^66874978 is an apocalyptic number.

66874978 is a deficient number, since it is larger than the sum of its proper divisors (34934894).

66874978 is a wasteful number, since it uses less digits than its factorization.

66874978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 499136.

The product of its digits is 4064256, while the sum is 55.

The square root of 66874978 is about 8177.7122717787. The cubic root of 66874978 is about 405.9020244548.

The spelling of 66874978 in words is "sixty-six million, eight hundred seventy-four thousand, nine hundred seventy-eight".