631978372 has 6 divisors (see below), whose sum is σ = 1105962158. Its totient is φ = 315989184.

The previous prime is 631978339. The next prime is 631978381. The reversal of 631978372 is 273879136.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 618317956 + 13660416 = 24866^2 + 3696^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78997293 + ... + 78997300.

Almost surely, 2^631978372 is an apocalyptic number.

It is an amenable number.

631978372 is a deficient number, since it is larger than the sum of its proper divisors (473983786).

631978372 is a wasteful number, since it uses less digits than its factorization.

631978372 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157994597 (or 157994595 counting only the distinct ones).

The product of its digits is 381024, while the sum is 46.

The square root of 631978372 is about 25139.1800184493. The cubic root of 631978372 is about 858.1582960218.

The spelling of 631978372 in words is "six hundred thirty-one million, nine hundred seventy-eight thousand, three hundred seventy-two".