28238925 has 48 divisors (see below), whose sum is σ = 54871488. Its totient is φ = 12633600.

The previous prime is 28238897. The next prime is 28238929. The reversal of 28238925 is 52983282.

It is not a de Polignac number, because 28238925 - 2⁷ = 28238797 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28238929) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 9409 + ... + 12041.

It is an arithmetic number, because the mean of its divisors is an integer number (1143156).

Almost surely, 2^28238925 is an apocalyptic number.

28238925 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28238925 is a deficient number, since it is larger than the sum of its proper divisors (26632563).

28238925 is a wasteful number, since it uses less digits than its factorization.

28238925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2670 (or 2665 counting only the distinct ones).

The product of its digits is 69120, while the sum is 39.

The square root of 28238925 is about 5314.0309558752. The cubic root of 28238925 is about 304.5201628146.

The spelling of 28238925 in words is "twenty-eight million, two hundred thirty-eight thousand, nine hundred twenty-five".