665464628 has 12 divisors (see below), whose sum is σ = 1170661632. Its totient is φ = 330989880.

The previous prime is 665464601. The next prime is 665464649. The reversal of 665464628 is 826464566.

It is a super-2 number, since 2×665464628² = 885686342238356768, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 434750 + ... + 436277.

It is an arithmetic number, because the mean of its divisors is an integer number (97555136).

Almost surely, 2^665464628 is an apocalyptic number.

It is an amenable number.

665464628 is a deficient number, since it is larger than the sum of its proper divisors (505197004).

665464628 is a wasteful number, since it uses less digits than its factorization.

665464628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 871222 (or 871220 counting only the distinct ones).

The product of its digits is 1658880, while the sum is 47.

The square root of 665464628 is about 25796.6010939426. The cubic root of 665464628 is about 873.0551101129.

The spelling of 665464628 in words is "six hundred sixty-five million, four hundred sixty-four thousand, six hundred twenty-eight".