25223512428 has 60 divisors (see below), whose sum is σ = 66680210520. Its totient is φ = 8313357888.

The previous prime is 25223512423. The next prime is 25223512429. The reversal of 25223512428 is 82421532252.

25223512428 is a `hidden beast` number, since 2 + 5 + 223 + 5 + 1 + 2 + 428 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 25223512392 and 25223512401.

It is not an unprimeable number, because it can be changed into a prime (25223512423) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 408526 + ... + 466197.

It is an arithmetic number, because the mean of its divisors is an integer number (1111336842).

Almost surely, 2^25223512428 is an apocalyptic number.

It is an amenable number.

25223512428 is an abundant number, since it is smaller than the sum of its proper divisors (41456698092).

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

25223512428 is a wasteful number, since it uses less digits than its factorization.

25223512428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 874828 (or 874817 counting only the distinct ones).

The product of its digits is 76800, while the sum is 36.

The spelling of 25223512428 in words is "twenty-five billion, two hundred twenty-three million, five hundred twelve thousand, four hundred twenty-eight".