28807560 has 48 divisors (see below), whose sum is σ = 93625740. Its totient is φ = 7681920.

The previous prime is 28807547. The next prime is 28807573. The reversal of 28807560 is 6570882.

It is an interprime number because it is at equal distance from previous prime (28807547) and next prime (28807573).

It can be written as a sum of positive squares in 2 ways, for example, as 24621444 + 4186116 = 4962^2 + 2046^2 .

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

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, 39651 + ... + 40370.

Almost surely, 2^28807560 is an apocalyptic number.

28807560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28807560 is an abundant number, since it is smaller than the sum of its proper divisors (64818180).

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

28807560 is a wasteful number, since it uses less digits than its factorization.

28807560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80038 (or 80031 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 36.

The square root of 28807560 is about 5367.2674611948. The cubic root of 28807560 is about 306.5505914411.

It can be divided in two parts, 2880 and 7560, that added together give a triangular number (10440 = T₁₄₄).

The spelling of 28807560 in words is "twenty-eight million, eight hundred seven thousand, five hundred sixty".