631344540 has 48 divisors (see below), whose sum is σ = 1860808320. Its totient is φ = 159497280.

The previous prime is 631344523. The next prime is 631344569. The reversal of 631344540 is 45443136.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 631344498 and 631344507.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 275766 + ... + 278045.

It is an arithmetic number, because the mean of its divisors is an integer number (38766840).

Almost surely, 2^631344540 is an apocalyptic number.

631344540 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

631344540 is an abundant number, since it is smaller than the sum of its proper divisors (1229463780).

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

631344540 is a wasteful number, since it uses less digits than its factorization.

631344540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 553842 (or 553840 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 30.

The square root of 631344540 is about 25126.5703986835. The cubic root of 631344540 is about 857.8713082831.

Adding to 631344540 its reverse (45443136), we get a palindrome (676787676).

The spelling of 631344540 in words is "six hundred thirty-one million, three hundred forty-four thousand, five hundred forty".