66904344 has 48 divisors (see below), whose sum is σ = 195140400. Its totient is φ = 20585664.

The previous prime is 66904303. The next prime is 66904381. The reversal of 66904344 is 44340966.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 66904299 and 66904308.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 34804 + ... + 36675.

It is an arithmetic number, because the mean of its divisors is an integer number (4065425).

Almost surely, 2^66904344 is an apocalyptic number.

It is an amenable number.

66904344 is an abundant number, since it is smaller than the sum of its proper divisors (128236056).

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

66904344 is a wasteful number, since it uses less digits than its factorization.

66904344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71504 (or 71497 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 36.

The square root of 66904344 is about 8179.5075646398. The cubic root of 66904344 is about 405.9614287089.

The spelling of 66904344 in words is "sixty-six million, nine hundred four thousand, three hundred forty-four".