28943725 has 6 divisors (see below), whose sum is σ = 35890250. Its totient is φ = 23154960.

The previous prime is 28943701. The next prime is 28943749. The reversal of 28943725 is 52734982.

It is an interprime number because it is at equal distance from previous prime (28943701) and next prime (28943749).

It can be written as a sum of positive squares in 3 ways, for example, as 149769 + 28793956 = 387^2 + 5366^2 .

It is a de Polignac number, because none of the positive numbers 2^k-28943725 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 578850 + ... + 578899.

Almost surely, 2^28943725 is an apocalyptic number.

28943725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28943725 is a deficient number, since it is larger than the sum of its proper divisors (6946525).

28943725 is a wasteful number, since it uses less digits than its factorization.

28943725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1157759 (or 1157754 counting only the distinct ones).

The product of its digits is 120960, while the sum is 40.

The square root of 28943725 is about 5379.9372672922. The cubic root of 28943725 is about 307.0328244248.

The spelling of 28943725 in words is "twenty-eight million, nine hundred forty-three thousand, seven hundred twenty-five".