51664408 has 16 divisors (see below), whose sum is σ = 97146000. Its totient is φ = 25758816.

The previous prime is 51664381. The next prime is 51664433. The reversal of 51664408 is 80446615.

It is a super-2 number, since 2×51664408² = 5338422107980928, 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, 6123 + ... + 11866.

It is an arithmetic number, because the mean of its divisors is an integer number (6071625).

Almost surely, 2^51664408 is an apocalyptic number.

It is an amenable number.

51664408 is a deficient number, since it is larger than the sum of its proper divisors (45481592).

51664408 is a wasteful number, since it uses less digits than its factorization.

51664408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18354 (or 18350 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 34.

The square root of 51664408 is about 7187.7957678276. The cubic root of 51664408 is about 372.4464328479.

The spelling of 51664408 in words is "fifty-one million, six hundred sixty-four thousand, four hundred eight".