641626552 has 64 divisors (see below), whose sum is σ = 1398458880. Its totient is φ = 270317952.

The previous prime is 641626519. The next prime is 641626571. The reversal of 641626552 is 255626146.

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

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, 997543 + ... + 998185.

It is an arithmetic number, because the mean of its divisors is an integer number (21850920).

Almost surely, 2^641626552 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 641626552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (699229440).

641626552 is an abundant number, since it is smaller than the sum of its proper divisors (756832328).

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

641626552 is a wasteful number, since it uses less digits than its factorization.

641626552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 932 (or 928 counting only the distinct ones).

The product of its digits is 86400, while the sum is 37.

The square root of 641626552 is about 25330.3484381877. The cubic root of 641626552 is about 862.5033209142.

The spelling of 641626552 in words is "six hundred forty-one million, six hundred twenty-six thousand, five hundred fifty-two".