28401025 has 6 divisors (see below), whose sum is σ = 35217302. Its totient is φ = 22720800.

The previous prime is 28401017. The next prime is 28401041. The reversal of 28401025 is 52010482.

It can be written as a sum of positive squares in 3 ways, for example, as 173056 + 28227969 = 416^2 + 5313^2 .

It is not a de Polignac number, because 28401025 - 2³ = 28401017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28400987 and 28401005.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 567996 + ... + 568045.

Almost surely, 2^28401025 is an apocalyptic number.

28401025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28401025 is a deficient number, since it is larger than the sum of its proper divisors (6816277).

28401025 is a wasteful number, since it uses less digits than its factorization.

28401025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1136051 (or 1136046 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 22.

The square root of 28401025 is about 5329.2612058333. The cubic root of 28401025 is about 305.1017308231.

The spelling of 28401025 in words is "twenty-eight million, four hundred one thousand, twenty-five".