66904722 has 24 divisors (see below), whose sum is σ = 145152540. Its totient is φ = 22272000.

The previous prime is 66904703. The next prime is 66904729. The reversal of 66904722 is 22740966.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 44635761 + 22268961 = 6681^2 + 4719^2 .

It is not an unprimeable number, because it can be changed into a prime (66904729) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14722 + ... + 18722.

Almost surely, 2^66904722 is an apocalyptic number.

66904722 is an abundant number, since it is smaller than the sum of its proper divisors (78247818).

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

66904722 is a wasteful number, since it uses less digits than its factorization.

66904722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4938 (or 4935 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 36.

The square root of 66904722 is about 8179.5306711327. The cubic root of 66904722 is about 405.9621932489.

The spelling of 66904722 in words is "sixty-six million, nine hundred four thousand, seven hundred twenty-two".