631691670 has 64 divisors (see below), whose sum is σ = 1604160000. Its totient is φ = 158754816.

The previous prime is 631691657. The next prime is 631691719. The reversal of 631691670 is 76196136.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 110646 + ... + 116214.

It is an arithmetic number, because the mean of its divisors is an integer number (25065000).

Almost surely, 2^631691670 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 631691670, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (802080000).

631691670 is an abundant number, since it is smaller than the sum of its proper divisors (972468330).

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

631691670 is a wasteful number, since it uses less digits than its factorization.

631691670 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5797.

The product of its (nonzero) digits is 40824, while the sum is 39.

The square root of 631691670 is about 25133.4770773962. The cubic root of 631691670 is about 858.0285062877.

The spelling of 631691670 in words is "six hundred thirty-one million, six hundred ninety-one thousand, six hundred seventy".