15625295440 has 80 divisors (see below), whose sum is σ = 36897044688. Its totient is φ = 6153043968.

The previous prime is 15625295431. The next prime is 15625295443. The reversal of 15625295440 is 4459252651.

It can be written as a sum of positive squares in 8 ways, for example, as 385886736 + 15239408704 = 19644^2 + 123448^2 .

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15625295443) 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, 1492464 + ... + 1502896.

Almost surely, 2^15625295440 is an apocalyptic number.

15625295440 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 15625295440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18448522344).

15625295440 is an abundant number, since it is smaller than the sum of its proper divisors (21271749248).

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

15625295440 is a wasteful number, since it uses less digits than its factorization.

15625295440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10736 (or 10730 counting only the distinct ones).

The product of its (nonzero) digits is 432000, while the sum is 43.

The spelling of 15625295440 in words is "fifteen billion, six hundred twenty-five million, two hundred ninety-five thousand, four hundred forty".