631380 has 48 divisors (see below), whose sum is σ = 1874880. Its totient is φ = 158208.

The previous prime is 631361. The next prime is 631387. The reversal of 631380 is 83136.

631380 = T₂₀ + T₂₁ + ... + T₁₅₅.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (631387) by changing a digit.

631380 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 711 + ... + 1329.

It is an arithmetic number, because the mean of its divisors is an integer number (39060).

2⁶³¹³⁸⁰ is an apocalyptic number.

631380 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 631380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (937440).

631380 is an abundant number, since it is smaller than the sum of its proper divisors (1243500).

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

631380 is a wasteful number, since it uses less digits than its factorization.

631380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 648 (or 646 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 631380 is about 794.5942360727. The cubic root of 631380 is about 85.7887369005.

The spelling of 631380 in words is "six hundred thirty-one thousand, three hundred eighty".