28988125 has 10 divisors (see below), whose sum is σ = 36224342. Its totient is φ = 23190000.

The previous prime is 28988117. The next prime is 28988137. The reversal of 28988125 is 52188982.

It can be written as a sum of positive squares in 5 ways, for example, as 9114361 + 19873764 = 3019^2 + 4458^2 .

It is not a de Polignac number, because 28988125 - 2³ = 28988117 is a prime.

It is a super-2 number, since 2×28988125² = 1680622782031250, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 22566 + ... + 23815.

Almost surely, 2^28988125 is an apocalyptic number.

28988125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28988125 is a deficient number, since it is larger than the sum of its proper divisors (7236217).

28988125 is an frugal number, since it uses more digits than its factorization.

28988125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46401 (or 46386 counting only the distinct ones).

The product of its digits is 92160, while the sum is 43.

The square root of 28988125 is about 5384.0621281705. The cubic root of 28988125 is about 307.1897414844.

The spelling of 28988125 in words is "twenty-eight million, nine hundred eighty-eight thousand, one hundred twenty-five".