25998187920 has 80 divisors (see below), whose sum is σ = 84836207040. Its totient is φ = 6567962112.

The previous prime is 25998187877. The next prime is 25998187951. The reversal of 25998187920 is 2978189952.

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

It is a Harshad number since it is a multiple of its sum of digits (60).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2846119 + ... + 2855238.

It is an arithmetic number, because the mean of its divisors is an integer number (1060452588).

Almost surely, 2^25998187920 is an apocalyptic number.

25998187920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25998187920 is an abundant number, since it is smaller than the sum of its proper divisors (58838019120).

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

25998187920 is a wasteful number, since it uses less digits than its factorization.

25998187920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5701392 (or 5701386 counting only the distinct ones).

The product of its (nonzero) digits is 6531840, while the sum is 60.

The spelling of 25998187920 in words is "twenty-five billion, nine hundred ninety-eight million, one hundred eighty-seven thousand, nine hundred twenty".