66704390 has 16 divisors (see below), whose sum is σ = 120323232. Its totient is φ = 26625024.

The previous prime is 66704387. The next prime is 66704411. The reversal of 66704390 is 9340766.

It is a self number, because there is not a number n which added to its sum of digits gives 66704390.

It is a congruent 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, 1979 + ... + 11718.

It is an arithmetic number, because the mean of its divisors is an integer number (7520202).

Almost surely, 2^66704390 is an apocalyptic number.

66704390 is a deficient number, since it is larger than the sum of its proper divisors (53618842).

66704390 is a wasteful number, since it uses less digits than its factorization.

66704390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14191.

The product of its (nonzero) digits is 27216, while the sum is 35.

The square root of 66704390 is about 8167.2755555326. The cubic root of 66704390 is about 405.5565989284.

The spelling of 66704390 in words is "sixty-six million, seven hundred four thousand, three hundred ninety".