625779448840 has 160 divisors (see below), whose sum is σ = 1768928638680. Its totient is φ = 198048485376.

The previous prime is 625779448817. The next prime is 625779448859. The reversal of 625779448840 is 48844977526.

It can be written as a sum of positive squares in 4 ways, for example, as 353042742276 + 272736706564 = 594174^2 + 522242^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 997912 + ... + 1499128.

Almost surely, 2^625779448840 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 625779448840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (884464319340).

625779448840 is an abundant number, since it is smaller than the sum of its proper divisors (1143149189840).

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

625779448840 is a wasteful number, since it uses less digits than its factorization.

625779448840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 501269 (or 501244 counting only the distinct ones).

The product of its (nonzero) digits is 108380160, while the sum is 64.

The spelling of 625779448840 in words is "six hundred twenty-five billion, seven hundred seventy-nine million, four hundred forty-eight thousand, eight hundred forty".