631408616 has 8 divisors (see below), whose sum is σ = 1183891170. Its totient is φ = 315704304.

The previous prime is 631408597. The next prime is 631408633. The reversal of 631408616 is 616804136.

It can be written as a sum of positive squares in only one way, i.e., 522122500 + 109286116 = 22850^2 + 10454^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39463031 + ... + 39463046.

Almost surely, 2^631408616 is an apocalyptic number.

It is an amenable number.

631408616 is a deficient number, since it is larger than the sum of its proper divisors (552482554).

631408616 is a wasteful number, since it uses less digits than its factorization.

631408616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78926083 (or 78926079 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 35.

The square root of 631408616 is about 25127.8454309159. The cubic root of 631408616 is about 857.9003294693.

The spelling of 631408616 in words is "six hundred thirty-one million, four hundred eight thousand, six hundred sixteen".