15625422720 has 256 divisors, whose sum is σ = 57250152000. Its totient is φ = 4022968320.

The previous prime is 15625422713. The next prime is 15625422727. The reversal of 15625422720 is 2722452651.

15625422720 is a `hidden beast` number, since 1 + 5 + 625 + 4 + 2 + 2 + 7 + 20 = 666.

It is an interprime number because it is at equal distance from previous prime (15625422713) and next prime (15625422727).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15625422727) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 485530 + ... + 516710.

Almost surely, 2^15625422720 is an apocalyptic number.

15625422720 is a gapful number since it is divisible by the number (10) 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 15625422720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28625076000).

15625422720 is an abundant number, since it is smaller than the sum of its proper divisors (41624729280).

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

15625422720 is a wasteful number, since it uses less digits than its factorization.

15625422720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31238 (or 31220 counting only the distinct ones).

The product of its (nonzero) digits is 67200, while the sum is 36.

The spelling of 15625422720 in words is "fifteen billion, six hundred twenty-five million, four hundred twenty-two thousand, seven hundred twenty".