664123242 has 16 divisors (see below), whose sum is σ = 1332440352. Its totient is φ = 220675440.

The previous prime is 664123237. The next prime is 664123253. The reversal of 664123242 is 242321466.

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, 172684 + ... + 176487.

It is an arithmetic number, because the mean of its divisors is an integer number (83277522).

Almost surely, 2^664123242 is an apocalyptic number.

664123242 is an abundant number, since it is smaller than the sum of its proper divisors (668317110).

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

664123242 is a wasteful number, since it uses less digits than its factorization.

664123242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 349493.

The product of its digits is 13824, while the sum is 30.

The square root of 664123242 is about 25770.5887010755. The cubic root of 664123242 is about 872.4681058831.

The spelling of 664123242 in words is "six hundred sixty-four million, one hundred twenty-three thousand, two hundred forty-two".