25428555 has 24 divisors (see below), whose sum is σ = 46397520. Its totient is φ = 12847680.

The previous prime is 25428553. The next prime is 25428581. The reversal of 25428555 is 55582452.

It is a happy number.

It is not a de Polignac number, because 25428555 - 2¹ = 25428553 is a prime.

It is a super-2 number, since 2×25428555² = 1293222818776050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (25428553) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14016 + ... + 15725.

It is an arithmetic number, because the mean of its divisors is an integer number (1933230).

Almost surely, 2^25428555 is an apocalyptic number.

25428555 is a deficient number, since it is larger than the sum of its proper divisors (20968965).

25428555 is a wasteful number, since it uses less digits than its factorization.

25428555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29771 (or 29768 counting only the distinct ones).

The product of its digits is 80000, while the sum is 36.

The square root of 25428555 is about 5042.6733981094. The cubic root of 25428555 is about 294.0631198642.

The spelling of 25428555 in words is "twenty-five million, four hundred twenty-eight thousand, five hundred fifty-five".