631780 has 24 divisors (see below), whose sum is σ = 1370880. Its totient is φ = 244320.

The previous prime is 631753. The next prime is 631789. The reversal of 631780 is 87136.

631780 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (631789) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 111 + ... + 1129.

It is an arithmetic number, because the mean of its divisors is an integer number (57120).

2⁶³¹⁷⁸⁰ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 631780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (685440).

631780 is an abundant number, since it is smaller than the sum of its proper divisors (739100).

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

631780 is a wasteful number, since it uses less digits than its factorization.

631780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1059 (or 1057 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 631780 is about 794.8458970140. The cubic root of 631780 is about 85.8068497383.

Subtracting from 631780 its reverse (87136), we obtain a square (544644 = 738²).

The spelling of 631780 in words is "six hundred thirty-one thousand, seven hundred eighty".