25582781790 has 24 divisors (see below), whose sum is σ = 66515232888. Its totient is φ = 6822075120.

The previous prime is 25582781771. The next prime is 25582781863. The reversal of 25582781790 is 9718728552.

25582781790 is a `hidden beast` number, since 2 + 558 + 2 + 7 + 81 + 7 + 9 + 0 = 666.

It is a super-2 number, since 2×25582781790² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 142126476 + ... + 142126655.

It is an arithmetic number, because the mean of its divisors is an integer number (2771468037).

Almost surely, 2^25582781790 is an apocalyptic number.

25582781790 is an abundant number, since it is smaller than the sum of its proper divisors (40932451098).

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

25582781790 is a wasteful number, since it uses less digits than its factorization.

25582781790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 284253144 (or 284253141 counting only the distinct ones).

The product of its (nonzero) digits is 2822400, while the sum is 54.

The spelling of 25582781790 in words is "twenty-five billion, five hundred eighty-two million, seven hundred eighty-one thousand, seven hundred ninety".