64790666 has 4 divisors (see below), whose sum is σ = 97186002. Its totient is φ = 32395332.

The previous prime is 64790657. The next prime is 64790699. The reversal of 64790666 is 66609746.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 64561225 + 229441 = 8035^2 + 479^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16197665 + ... + 16197668.

Almost surely, 2^64790666 is an apocalyptic number.

64790666 is a deficient number, since it is larger than the sum of its proper divisors (32395336).

64790666 is a wasteful number, since it uses less digits than its factorization.

64790666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32395335.

The product of its (nonzero) digits is 326592, while the sum is 44.

The square root of 64790666 is about 8049.2649353839. The cubic root of 64790666 is about 401.6404836691.

It can be divided in two parts, 64790 and 666, that added together give a palindrome (65456).

The spelling of 64790666 in words is "sixty-four million, seven hundred ninety thousand, six hundred sixty-six".