28013880 has 64 divisors (see below), whose sum is σ = 85847040. Its totient is φ = 7309952.

The previous prime is 28013879. The next prime is 28013893. The reversal of 28013880 is 8831082.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3157 + ... + 8123.

It is an arithmetic number, because the mean of its divisors is an integer number (1341360).

Almost surely, 2^28013880 is an apocalyptic number.

28013880 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28013880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42923520).

28013880 is an abundant number, since it is smaller than the sum of its proper divisors (57833160).

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

28013880 is a wasteful number, since it uses less digits than its factorization.

28013880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5028 (or 5024 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 30.

The square root of 28013880 is about 5292.8139963539. The cubic root of 28013880 is about 303.7090649166.

The spelling of 28013880 in words is "twenty-eight million, thirteen thousand, eight hundred eighty".