625525840 has 80 divisors (see below), whose sum is σ = 1481936400. Its totient is φ = 245514240.

The previous prime is 625525819. The next prime is 625525841. The reversal of 625525840 is 48525526.

It can be written as a sum of positive squares in 8 ways, for example, as 80209936 + 545315904 = 8956^2 + 23352^2 .

It is a tau number, because it is divible by the number of its divisors (80).

It is a self number, because there is not a number n which added to its sum of digits gives 625525840.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (625525841) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1155970 + ... + 1156510.

It is an arithmetic number, because the mean of its divisors is an integer number (18524205).

Almost surely, 2^625525840 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 625525840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (740968200).

625525840 is an abundant number, since it is smaller than the sum of its proper divisors (856410560).

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

625525840 is a wasteful number, since it uses less digits than its factorization.

625525840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 800 (or 794 counting only the distinct ones).

The product of its (nonzero) digits is 96000, while the sum is 37.

The square root of 625525840 is about 25010.5145888684. The cubic root of 625525840 is about 855.2276857912.

The spelling of 625525840 in words is "six hundred twenty-five million, five hundred twenty-five thousand, eight hundred forty".