28869520 has 20 divisors (see below), whose sum is σ = 67121820. Its totient is φ = 11547776.

The previous prime is 28869517. The next prime is 28869551. The reversal of 28869520 is 2596882.

It can be written as a sum of positive squares in 2 ways, for example, as 18215824 + 10653696 = 4268^2 + 3264^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a Harshad number since it is a multiple of its sum of digits (40).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 180355 + ... + 180514.

It is an arithmetic number, because the mean of its divisors is an integer number (3356091).

Almost surely, 2^28869520 is an apocalyptic number.

28869520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28869520 is an abundant number, since it is smaller than the sum of its proper divisors (38252300).

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

28869520 is a wasteful number, since it uses less digits than its factorization.

28869520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 360882 (or 360876 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 40.

The square root of 28869520 is about 5373.0363855087. The cubic root of 28869520 is about 306.7702128807.

The spelling of 28869520 in words is "twenty-eight million, eight hundred sixty-nine thousand, five hundred twenty".