25708615920 has 400 divisors, whose sum is σ = 97754180832. Its totient is φ = 6223288320.

The previous prime is 25708615903. The next prime is 25708615949. The reversal of 25708615920 is 2951680752.

25708615920 is a `hidden beast` number, since 2 + 5 + 7 + 0 + 8 + 615 + 9 + 20 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 5136139 + ... + 5141141.

Almost surely, 2^25708615920 is an apocalyptic number.

25708615920 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 25708615920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (48877090416).

25708615920 is an abundant number, since it is smaller than the sum of its proper divisors (72045564912).

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

25708615920 is a wasteful number, since it uses less digits than its factorization.

25708615920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5102 (or 5087 counting only the distinct ones).

The product of its (nonzero) digits is 302400, while the sum is 45.

The spelling of 25708615920 in words is "twenty-five billion, seven hundred eight million, six hundred fifteen thousand, nine hundred twenty".