28801380 has 24 divisors (see below), whose sum is σ = 80644032. Its totient is φ = 7680352.

The previous prime is 28801361. The next prime is 28801439. The reversal of 28801380 is 8310882.

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

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, 239952 + ... + 240071.

It is an arithmetic number, because the mean of its divisors is an integer number (3360168).

Almost surely, 2^28801380 is an apocalyptic number.

28801380 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28801380 is an abundant number, since it is smaller than the sum of its proper divisors (51842652).

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

28801380 is a wasteful number, since it uses less digits than its factorization.

28801380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 480035 (or 480033 counting only the distinct ones).

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

The square root of 28801380 is about 5366.6917183680. The cubic root of 28801380 is about 306.5286687450.

The spelling of 28801380 in words is "twenty-eight million, eight hundred one thousand, three hundred eighty".