28140025 has 12 divisors (see below), whose sum is σ = 35172352. Its totient is φ = 22332240.

The previous prime is 28140023. The next prime is 28140029. The reversal of 28140025 is 52004182.

It is not a de Polignac number, because 28140025 - 2¹ = 28140023 is a prime.

It is a super-2 number, since 2×28140025² = 1583722014001250, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28139978 and 28140005.

It is not an unprimeable number, because it can be changed into a prime (28140023) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1257 + ... + 7606.

Almost surely, 2^28140025 is an apocalyptic number.

28140025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28140025 is a deficient number, since it is larger than the sum of its proper divisors (7032327).

28140025 is a wasteful number, since it uses less digits than its factorization.

28140025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9000 (or 8995 counting only the distinct ones).

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

The square root of 28140025 is about 5304.7172403437. The cubic root of 28140025 is about 304.1642442625.

The spelling of 28140025 in words is "twenty-eight million, one hundred forty thousand, twenty-five".