28378925 has 12 divisors (see below), whose sum is σ = 36009600. Its totient is φ = 22174320.

The previous prime is 28378901. The next prime is 28378937. The reversal of 28378925 is 52987382.

It is not a de Polignac number, because 28378925 - 2²² = 24184621 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12125 + ... + 14274.

It is an arithmetic number, because the mean of its divisors is an integer number (3000800).

Almost surely, 2^28378925 is an apocalyptic number.

28378925 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28378925 is a deficient number, since it is larger than the sum of its proper divisors (7630675).

28378925 is a wasteful number, since it uses less digits than its factorization.

28378925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26452 (or 26447 counting only the distinct ones).

The product of its digits is 241920, while the sum is 44.

The square root of 28378925 is about 5327.1873441808. The cubic root of 28378925 is about 305.0225729061.

The spelling of 28378925 in words is "twenty-eight million, three hundred seventy-eight thousand, nine hundred twenty-five".