28012880 has 40 divisors (see below), whose sum is σ = 74435712. Its totient is φ = 9604224.

The previous prime is 28012879. The next prime is 28012903. The reversal of 28012880 is 8821082.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24452 + ... + 25571.

Almost surely, 2^28012880 is an apocalyptic number.

28012880 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28012880 is an abundant number, since it is smaller than the sum of its proper divisors (46422832).

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

28012880 is a wasteful number, since it uses less digits than its factorization.

28012880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50043 (or 50037 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 29.

The square root of 28012880 is about 5292.7195278042. The cubic root of 28012880 is about 303.7054510809.

The spelling of 28012880 in words is "twenty-eight million, twelve thousand, eight hundred eighty".