25578028 has 24 divisors (see below), whose sum is σ = 53849600. Its totient is φ = 10384848.

The previous prime is 25577999. The next prime is 25578031. The reversal of 25578028 is 82087552.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23508 + ... + 24571.

Almost surely, 2^25578028 is an apocalyptic number.

25578028 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

25578028 is an abundant number, since it is smaller than the sum of its proper divisors (28271572).

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

25578028 is a wasteful number, since it uses less digits than its factorization.

25578028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48109 (or 48107 counting only the distinct ones).

The product of its (nonzero) digits is 44800, while the sum is 37.

The square root of 25578028 is about 5057.4724912747. The cubic root of 25578028 is about 294.6381774859.

It can be divided in two parts, 2557 and 8028, that added together give a triangular number (10585 = T₁₄₅).

The spelling of 25578028 in words is "twenty-five million, five hundred seventy-eight thousand, twenty-eight".