66972794 has 16 divisors (see below), whose sum is σ = 114964800. Its totient is φ = 28664064.

The previous prime is 66972781. The next prime is 66972811. The reversal of 66972794 is 49727966.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9242 + ... + 14810.

It is an arithmetic number, because the mean of its divisors is an integer number (7185300).

Almost surely, 2^66972794 is an apocalyptic number.

66972794 is a deficient number, since it is larger than the sum of its proper divisors (47992006).

66972794 is a wasteful number, since it uses less digits than its factorization.

66972794 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6437.

The product of its digits is 1143072, while the sum is 50.

The square root of 66972794 is about 8183.6907321819. The cubic root of 66972794 is about 406.0998282350.

The spelling of 66972794 in words is "sixty-six million, nine hundred seventy-two thousand, seven hundred ninety-four".