631781612 has 48 divisors (see below), whose sum is σ = 1422919680. Its totient is φ = 238204800.

The previous prime is 631781611. The next prime is 631781627. The reversal of 631781612 is 216187136.

It is a super-2 number, since 2×631781612² = 798296010522637088, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (631781611) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23537 + ... + 42632.

It is an arithmetic number, because the mean of its divisors is an integer number (29644160).

Almost surely, 2^631781612 is an apocalyptic number.

631781612 is a gapful number since it is divisible by the number (62) formed by its first and last digit.

It is an amenable number.

631781612 is an abundant number, since it is smaller than the sum of its proper divisors (791138068).

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

631781612 is a wasteful number, since it uses less digits than its factorization.

631781612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66222 (or 66220 counting only the distinct ones).

The product of its digits is 12096, while the sum is 35.

The square root of 631781612 is about 25135.2663005587. The cubic root of 631781612 is about 858.0692271758.

The spelling of 631781612 in words is "six hundred thirty-one million, seven hundred eighty-one thousand, six hundred twelve".