250715640 has 256 divisors, whose sum is σ = 945561600. Its totient is φ = 51853824.

The previous prime is 250715639. The next prime is 250715651. The reversal of 250715640 is 46517052.

250715640 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 250715598 and 250715607.

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, 366739 + ... + 367421.

It is an arithmetic number, because the mean of its divisors is an integer number (3693600).

Almost surely, 2^250715640 is an apocalyptic number.

250715640 is a gapful number since it is divisible by the number (20) 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 250715640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (472780800).

250715640 is an abundant number, since it is smaller than the sum of its proper divisors (694845960).

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

250715640 is a wasteful number, since it uses less digits than its factorization.

250715640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 746 (or 742 counting only the distinct ones).

The product of its (nonzero) digits is 8400, while the sum is 30.

The square root of 250715640 is about 15834.0026525197. The cubic root of 250715640 is about 630.5610522297.

The spelling of 250715640 in words is "two hundred fifty million, seven hundred fifteen thousand, six hundred forty".