28641925 has 12 divisors (see below), whose sum is σ = 38248420. Its totient is φ = 21150720.

The previous prime is 28641917. The next prime is 28641953. The reversal of 28641925 is 52914682.

It can be written as a sum of positive squares in 6 ways, for example, as 6155361 + 22486564 = 2481^2 + 4742^2 .

It is not a de Polignac number, because 28641925 - 2³ = 28641917 is a prime.

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 43740 + ... + 44389.

Almost surely, 2^28641925 is an apocalyptic number.

28641925 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28641925 is a deficient number, since it is larger than the sum of its proper divisors (9606495).

28641925 is a wasteful number, since it uses less digits than its factorization.

28641925 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88152 (or 88147 counting only the distinct ones).

The product of its digits is 34560, while the sum is 37.

The square root of 28641925 is about 5351.8151126510. The cubic root of 28641925 is about 305.9619365416.

The spelling of 28641925 in words is "twenty-eight million, six hundred forty-one thousand, nine hundred twenty-five".