25297481790 has 480 divisors, whose sum is σ = 84438097920. Its totient is φ = 5308426368.

The previous prime is 25297481789. The next prime is 25297481819. The reversal of 25297481790 is 9718479252.

25297481790 is a `hidden beast` number, since 2 + 5 + 2 + 97 + 481 + 79 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 239 ways as a sum of consecutive naturals, for example, 199192707 + ... + 199192833.

It is an arithmetic number, because the mean of its divisors is an integer number (175912704).

Almost surely, 2^25297481790 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25297481790, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42219048960).

25297481790 is an abundant number, since it is smaller than the sum of its proper divisors (59140616130).

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

25297481790 is a wasteful number, since it uses less digits than its factorization.

25297481790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 258 (or 206 counting only the distinct ones).

The product of its (nonzero) digits is 2540160, while the sum is 54.

The spelling of 25297481790 in words is "twenty-five billion, two hundred ninety-seven million, four hundred eighty-one thousand, seven hundred ninety".