25987731240 has 32 divisors (see below), whose sum is σ = 77963194080. Its totient is φ = 6930061632.

The previous prime is 25987731199. The next prime is 25987731269. The reversal of 25987731240 is 4213778952.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 25987731240.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 108282094 + ... + 108282333.

It is an arithmetic number, because the mean of its divisors is an integer number (2436349815).

Almost surely, 2^25987731240 is an apocalyptic number.

25987731240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25987731240 is an abundant number, since it is smaller than the sum of its proper divisors (51975462840).

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

25987731240 is a wasteful number, since it uses less digits than its factorization.

25987731240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216564441 (or 216564437 counting only the distinct ones).

The product of its (nonzero) digits is 846720, while the sum is 48.

The spelling of 25987731240 in words is "twenty-five billion, nine hundred eighty-seven million, seven hundred thirty-one thousand, two hundred forty".