28380456 has 96 divisors (see below), whose sum is σ = 85918560. Its totient is φ = 8724672.

The previous prime is 28380431. The next prime is 28380479. The reversal of 28380456 is 65408382.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 28380456.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 24711 + ... + 25833.

It is an arithmetic number, because the mean of its divisors is an integer number (894985).

Almost surely, 2^28380456 is an apocalyptic number.

28380456 is a gapful number since it is divisible by the number (26) 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 28380456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42959280).

28380456 is an abundant number, since it is smaller than the sum of its proper divisors (57538104).

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

28380456 is a wasteful number, since it uses less digits than its factorization.

28380456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1157 (or 1141 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 36.

The square root of 28380456 is about 5327.3310390851. The cubic root of 28380456 is about 305.0280579760.

The spelling of 28380456 in words is "twenty-eight million, three hundred eighty thousand, four hundred fifty-six".