28849725 has 18 divisors (see below), whose sum is σ = 51673466. Its totient is φ = 15386400.

The previous prime is 28849699. The next prime is 28849727. The reversal of 28849725 is 52794882.

It can be written as a sum of positive squares in 3 ways, for example, as 1695204 + 27154521 = 1302^2 + 5211^2 .

It is not a de Polignac number, because 28849725 - 2¹¹ = 28847677 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28849727) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 63886 + ... + 64335.

Almost surely, 2^28849725 is an apocalyptic number.

28849725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28849725 is a deficient number, since it is larger than the sum of its proper divisors (22823741).

28849725 is a wasteful number, since it uses less digits than its factorization.

28849725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128237 (or 128229 counting only the distinct ones).

The product of its digits is 322560, while the sum is 45.

The square root of 28849725 is about 5371.1940013371. The cubic root of 28849725 is about 306.7000823438.

The spelling of 28849725 in words is "twenty-eight million, eight hundred forty-nine thousand, seven hundred twenty-five".