28551725 has 6 divisors (see below), whose sum is σ = 35404170. Its totient is φ = 22841360.

The previous prime is 28551709. The next prime is 28551749. The reversal of 28551725 is 52715582.

It can be written as a sum of positive squares in 3 ways, for example, as 7557001 + 20994724 = 2749^2 + 4582^2 .

It is not a de Polignac number, because 28551725 - 2⁴ = 28551709 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, 571010 + ... + 571059.

It is an arithmetic number, because the mean of its divisors is an integer number (5900695).

Almost surely, 2^28551725 is an apocalyptic number.

28551725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28551725 is a deficient number, since it is larger than the sum of its proper divisors (6852445).

28551725 is a wasteful number, since it uses less digits than its factorization.

28551725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1142079 (or 1142074 counting only the distinct ones).

The product of its digits is 28000, while the sum is 35.

The square root of 28551725 is about 5343.3814200373. The cubic root of 28551725 is about 305.6404173230.

The spelling of 28551725 in words is "twenty-eight million, five hundred fifty-one thousand, seven hundred twenty-five".