66990912 has 28 divisors (see below), whose sum is σ = 177247296. Its totient is φ = 22330240.

The previous prime is 66990893. The next prime is 66990919. The reversal of 66990912 is 21909966.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66990919) 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, 174264 + ... + 174647.

Almost surely, 2^66990912 is an apocalyptic number.

It is an amenable number.

66990912 is an abundant number, since it is smaller than the sum of its proper divisors (110256384).

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

66990912 is a wasteful number, since it uses less digits than its factorization.

66990912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 348926 (or 348916 counting only the distinct ones).

The product of its (nonzero) digits is 52488, while the sum is 42.

The square root of 66990912 is about 8184.7976150910. The cubic root of 66990912 is about 406.1364453589.

The spelling of 66990912 in words is "sixty-six million, nine hundred ninety thousand, nine hundred twelve".