66978274 has 16 divisors (see below), whose sum is σ = 109900800. Its totient is φ = 30361360.

The previous prime is 66978269. The next prime is 66978299. The reversal of 66978274 is 47287966.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4452 + ... + 12400.

It is an arithmetic number, because the mean of its divisors is an integer number (6868800).

Almost surely, 2^66978274 is an apocalyptic number.

66978274 is a deficient number, since it is larger than the sum of its proper divisors (42922526).

66978274 is a wasteful number, since it uses less digits than its factorization.

66978274 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8345.

The product of its digits is 1016064, while the sum is 49.

The square root of 66978274 is about 8184.0255375946. The cubic root of 66978274 is about 406.1109042069.

The spelling of 66978274 in words is "sixty-six million, nine hundred seventy-eight thousand, two hundred seventy-four".