66973836 has 24 divisors (see below), whose sum is σ = 157180464. Its totient is φ = 22194880.

The previous prime is 66973799. The next prime is 66973843. The reversal of 66973836 is 63837966.

It is a happy number.

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, 14055 + ... + 18206.

It is an arithmetic number, because the mean of its divisors is an integer number (6549186).

Almost surely, 2^66973836 is an apocalyptic number.

It is an amenable number.

66973836 is an abundant number, since it is smaller than the sum of its proper divisors (90206628).

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

66973836 is a wasteful number, since it uses less digits than its factorization.

66973836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32441 (or 32439 counting only the distinct ones).

The product of its digits is 979776, while the sum is 48.

The square root of 66973836 is about 8183.7543951416. The cubic root of 66973836 is about 406.1019343331.

The spelling of 66973836 in words is "sixty-six million, nine hundred seventy-three thousand, eight hundred thirty-six".