25178652728 has 16 divisors (see below), whose sum is σ = 47214841680. Its totient is φ = 12588028288.

The previous prime is 25178652701. The next prime is 25178652749. The reversal of 25178652728 is 82725687152.

It is a self number, because there is not a number n which added to its sum of digits gives 25178652728.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 77201 + ... + 237312.

It is an arithmetic number, because the mean of its divisors is an integer number (2950927605).

Almost surely, 2^25178652728 is an apocalyptic number.

It is an amenable number.

25178652728 is a deficient number, since it is larger than the sum of its proper divisors (22036188952).

25178652728 is a wasteful number, since it uses less digits than its factorization.

25178652728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 324526 (or 324522 counting only the distinct ones).

The product of its digits is 3763200, while the sum is 53.

The spelling of 25178652728 in words is "twenty-five billion, one hundred seventy-eight million, six hundred fifty-two thousand, seven hundred twenty-eight".