664228494 has 12 divisors (see below), whose sum is σ = 1439161776. Its totient is φ = 221409492.

The previous prime is 664228417. The next prime is 664228507. The reversal of 664228494 is 494822466.

664228494 is a `hidden beast` number, since 66 + 422 + 84 + 94 = 666.

It is a super-3 number, since 3×664228494³ (a number of 27 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 18450774 + ... + 18450809.

It is an arithmetic number, because the mean of its divisors is an integer number (119930148).

Almost surely, 2^664228494 is an apocalyptic number.

664228494 is an abundant number, since it is smaller than the sum of its proper divisors (774933282).

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

664228494 is a wasteful number, since it uses less digits than its factorization.

664228494 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36901591 (or 36901588 counting only the distinct ones).

The product of its digits is 663552, while the sum is 45.

The square root of 664228494 is about 25772.6307155478. The cubic root of 664228494 is about 872.5141937960.

The spelling of 664228494 in words is "six hundred sixty-four million, two hundred twenty-eight thousand, four hundred ninety-four".