630979440 has 320 divisors, whose sum is σ = 2435844096. Its totient is φ = 131567616.

The previous prime is 630979423. The next prime is 630979451. The reversal of 630979440 is 44979036.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a junction number, because it is equal to n+sod(n) for n = 630979392 and 630979401.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3647194 + ... + 3647366.

Almost surely, 2^630979440 is an apocalyptic number.

630979440 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 630979440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1217922048).

630979440 is an abundant number, since it is smaller than the sum of its proper divisors (1804864656).

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

630979440 is a wasteful number, since it uses less digits than its factorization.

630979440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 376 (or 370 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 42.

The square root of 630979440 is about 25119.3041304890. The cubic root of 630979440 is about 857.7059103694.

The spelling of 630979440 in words is "six hundred thirty million, nine hundred seventy-nine thousand, four hundred forty".