66947944 has 32 divisors (see below), whose sum is σ = 151012800. Its totient is φ = 27181440.

The previous prime is 66947899. The next prime is 66947953. The reversal of 66947944 is 44974966.

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, 30397 + ... + 32524.

It is an arithmetic number, because the mean of its divisors is an integer number (4719150).

Almost surely, 2^66947944 is an apocalyptic number.

It is an amenable number.

66947944 is an abundant number, since it is smaller than the sum of its proper divisors (84064856).

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

66947944 is a wasteful number, since it uses less digits than its factorization.

66947944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62953 (or 62949 counting only the distinct ones).

The product of its digits is 1306368, while the sum is 49.

The square root of 66947944 is about 8182.1723276890. The cubic root of 66947944 is about 406.0495947569.

The spelling of 66947944 in words is "sixty-six million, nine hundred forty-seven thousand, nine hundred forty-four".