28142880 has 48 divisors (see below), whose sum is σ = 88651584. Its totient is φ = 7504640.

The previous prime is 28142879. The next prime is 28142911. The reversal of 28142880 is 8824182.

It is a tau number, because it is divible by the number of its divisors (48).

It is a hoax number, since the sum of its digits (33) coincides with the sum of the digits of its distinct prime factors.

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, 28836 + ... + 29795.

It is an arithmetic number, because the mean of its divisors is an integer number (1846908).

Almost surely, 2^28142880 is an apocalyptic number.

28142880 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28142880 is an abundant number, since it is smaller than the sum of its proper divisors (60508704).

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

28142880 is a wasteful number, since it uses less digits than its factorization.

28142880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58649 (or 58641 counting only the distinct ones).

The product of its (nonzero) digits is 8192, while the sum is 33.

The square root of 28142880 is about 5304.9863336299. The cubic root of 28142880 is about 304.1745304362.

The spelling of 28142880 in words is "twenty-eight million, one hundred forty-two thousand, eight hundred eighty".