28078860 has 48 divisors (see below), whose sum is σ = 82043136. Its totient is φ = 7161792.

The previous prime is 28078859. The next prime is 28078861. The reversal of 28078860 is 6887082.

It is an interprime number because it is at equal distance from previous prime (28078859) and next prime (28078861).

It is not an unprimeable number, because it can be changed into a prime (28078861) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8794 + ... + 11553.

It is an arithmetic number, because the mean of its divisors is an integer number (1709232).

Almost surely, 2^28078860 is an apocalyptic number.

28078860 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28078860 is an abundant number, since it is smaller than the sum of its proper divisors (53964276).

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

28078860 is a wasteful number, since it uses less digits than its factorization.

28078860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20382 (or 20380 counting only the distinct ones).

The product of its (nonzero) digits is 43008, while the sum is 39.

The square root of 28078860 is about 5298.9489523867. The cubic root of 28078860 is about 303.9437078364.

The spelling of 28078860 in words is "twenty-eight million, seventy-eight thousand, eight hundred sixty".