66904012 has 18 divisors (see below), whose sum is σ = 136197852. Its totient is φ = 28673064.

The previous prime is 66904003. The next prime is 66904031. The reversal of 66904012 is 21040966.

It is a super-2 number, since 2×66904012² = 8952293643392288, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (28).

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 5 ways as a sum of consecutive naturals, for example, 170478 + ... + 170869.

Almost surely, 2^66904012 is an apocalyptic number.

It is an amenable number.

66904012 is an abundant number, since it is smaller than the sum of its proper divisors (69293840).

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

66904012 is a wasteful number, since it uses less digits than its factorization.

66904012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 341365 (or 341356 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 66904012 is about 8179.4872699944. The cubic root of 66904012 is about 405.9607572058.

Adding to 66904012 its reverse (21040966), we get a palindrome (87944978).

The spelling of 66904012 in words is "sixty-six million, nine hundred four thousand, twelve".