28453725 has 18 divisors (see below), whose sum is σ = 50964186. Its totient is φ = 15175200.

The previous prime is 28453709. The next prime is 28453741. The reversal of 28453725 is 52735482.

28453725 is a `hidden beast` number, since 284 + 5 + 372 + 5 = 666.

It is an interprime number because it is at equal distance from previous prime (28453709) and next prime (28453741).

It can be written as a sum of positive squares in 3 ways, for example, as 2013561 + 26440164 = 1419^2 + 5142^2 .

It is not a de Polignac number, because 28453725 - 2⁴ = 28453709 is a prime.

It is a super-2 number, since 2×28453725² = 1619228932751250, which contains 22 as substring.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 28453725.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 63006 + ... + 63455.

Almost surely, 2^28453725 is an apocalyptic number.

28453725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28453725 is a deficient number, since it is larger than the sum of its proper divisors (22510461).

28453725 is a wasteful number, since it uses less digits than its factorization.

28453725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126477 (or 126469 counting only the distinct ones).

The product of its digits is 67200, while the sum is 36.

The square root of 28453725 is about 5334.2033144604. The cubic root of 28453725 is about 305.2903264380.

The spelling of 28453725 in words is "twenty-eight million, four hundred fifty-three thousand, seven hundred twenty-five".