28371725 has 24 divisors (see below), whose sum is σ = 37540008. Its totient is φ = 21196800.

The previous prime is 28371709. The next prime is 28371737. The reversal of 28371725 is 52717382.

It can be written as a sum of positive squares in 12 ways, for example, as 5004169 + 23367556 = 2237^2 + 4834^2 .

It is not a de Polignac number, because 28371725 - 2⁴ = 28371709 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 102287 + ... + 102563.

It is an arithmetic number, because the mean of its divisors is an integer number (1564167).

Almost surely, 2^28371725 is an apocalyptic number.

28371725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28371725 is a deficient number, since it is larger than the sum of its proper divisors (9168283).

28371725 is a wasteful number, since it uses less digits than its factorization.

28371725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 545 (or 540 counting only the distinct ones).

The product of its digits is 23520, while the sum is 35.

The square root of 28371725 is about 5326.5115225633. The cubic root of 28371725 is about 304.9967750264.

The spelling of 28371725 in words is "twenty-eight million, three hundred seventy-one thousand, seven hundred twenty-five".