28887620 has 24 divisors (see below), whose sum is σ = 61349400. Its totient is φ = 11424512.

The previous prime is 28887613. The next prime is 28887623. The reversal of 28887620 is 2678882.

It can be written as a sum of positive squares in 4 ways, for example, as 5924356 + 22963264 = 2434^2 + 4792^2 .

It is not an unprimeable number, because it can be changed into a prime (28887623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6335 + ... + 9894.

It is an arithmetic number, because the mean of its divisors is an integer number (2556225).

Almost surely, 2^28887620 is an apocalyptic number.

28887620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28887620 is an abundant number, since it is smaller than the sum of its proper divisors (32461780).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28887620 is a wasteful number, since it uses less digits than its factorization.

28887620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16327 (or 16325 counting only the distinct ones).

The product of its (nonzero) digits is 86016, while the sum is 41.

The square root of 28887620 is about 5374.7204578471. The cubic root of 28887620 is about 306.8343102500.

The spelling of 28887620 in words is "twenty-eight million, eight hundred eighty-seven thousand, six hundred twenty".