626139648 has 120 divisors (see below), whose sum is σ = 1913619708. Its totient is φ = 196411392.

The previous prime is 626139629. The next prime is 626139677. The reversal of 626139648 is 846931626.

626139648 is a `hidden beast` number, since 626 + 13 + 9 + 6 + 4 + 8 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 620607744 + 5531904 = 24912^2 + 2352^2 .

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 74340 + ... + 82332.

Almost surely, 2^626139648 is an apocalyptic number.

626139648 is a gapful number since it is divisible by the number (68) 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 626139648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (956809854).

626139648 is an abundant number, since it is smaller than the sum of its proper divisors (1287480060).

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

626139648 is a wasteful number, since it uses less digits than its factorization.

626139648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8034 (or 8015 counting only the distinct ones).

The product of its digits is 373248, while the sum is 45.

The square root of 626139648 is about 25022.7825790818. The cubic root of 626139648 is about 855.5073299729.

The spelling of 626139648 in words is "six hundred twenty-six million, one hundred thirty-nine thousand, six hundred forty-eight".