28870512 has 40 divisors (see below), whose sum is σ = 81363840. Its totient is φ = 8748480.

The previous prime is 28870511. The next prime is 28870553. The reversal of 28870512 is 21507882.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28870511) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26812 + ... + 27867.

It is an arithmetic number, because the mean of its divisors is an integer number (2034096).

Almost surely, 2^28870512 is an apocalyptic number.

28870512 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

28870512 is an abundant number, since it is smaller than the sum of its proper divisors (52493328).

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

28870512 is a wasteful number, since it uses less digits than its factorization.

28870512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54701 (or 54695 counting only the distinct ones).

The product of its (nonzero) digits is 8960, while the sum is 33.

The square root of 28870512 is about 5373.1286975095. The cubic root of 28870512 is about 306.7737265353.

It can be divided in two parts, 28 and 870512, that added together give a triangular number (870540 = T₁₃₁₉).

The spelling of 28870512 in words is "twenty-eight million, eight hundred seventy thousand, five hundred twelve".