631890 has 96 divisors (see below), whose sum is σ = 2021760. Its totient is φ = 133632.

The previous prime is 631889. The next prime is 631901. The reversal of 631890 is 98136.

It is an Ulam number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 10681 + ... + 10739.

It is an arithmetic number, because the mean of its divisors is an integer number (21060).

2⁶³¹⁸⁹⁰ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 631890, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1010880).

631890 is an abundant number, since it is smaller than the sum of its proper divisors (1389870).

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

631890 is a wasteful number, since it uses less digits than its factorization.

631890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96 (or 93 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 631890 is about 794.9150898052. The cubic root of 631890 is about 85.8118294284.

It can be divided in two parts, 631 and 890, that added together give a square (1521 = 39²).

The spelling of 631890 in words is "six hundred thirty-one thousand, eight hundred ninety".