28970525 has 6 divisors (see below), whose sum is σ = 35923482. Its totient is φ = 23176400.

The previous prime is 28970467. The next prime is 28970531. The reversal of 28970525 is 52507982.

It can be written as a sum of positive squares in 3 ways, for example, as 5331481 + 23639044 = 2309^2 + 4862^2 .

It is not a de Polignac number, because 28970525 - 2¹⁴ = 28954141 is a prime.

It is a Duffinian 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 5 ways as a sum of consecutive naturals, for example, 579386 + ... + 579435.

It is an arithmetic number, because the mean of its divisors is an integer number (5987247).

Almost surely, 2^28970525 is an apocalyptic number.

28970525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28970525 is a deficient number, since it is larger than the sum of its proper divisors (6952957).

28970525 is a wasteful number, since it uses less digits than its factorization.

28970525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1158831 (or 1158826 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 38.

The square root of 28970525 is about 5382.4274263570. The cubic root of 28970525 is about 307.1275593092.

The spelling of 28970525 in words is "twenty-eight million, nine hundred seventy thousand, five hundred twenty-five".