28872540 has 36 divisors (see below), whose sum is σ = 87580584. Its totient is φ = 7699296.

The previous prime is 28872539. The next prime is 28872551. The reversal of 28872540 is 4527882.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 28872495 and 28872504.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 80022 + ... + 80381.

It is an arithmetic number, because the mean of its divisors is an integer number (2432794).

Almost surely, 2^28872540 is an apocalyptic number.

28872540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28872540 is an abundant number, since it is smaller than the sum of its proper divisors (58708044).

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

28872540 is a wasteful number, since it uses less digits than its factorization.

28872540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160418 (or 160413 counting only the distinct ones).

The product of its (nonzero) digits is 35840, while the sum is 36.

The square root of 28872540 is about 5373.3174110599. The cubic root of 28872540 is about 306.7809094416.

The spelling of 28872540 in words is "twenty-eight million, eight hundred seventy-two thousand, five hundred forty".