28387842 has 32 divisors (see below), whose sum is σ = 67709952. Its totient is φ = 7757904.

The previous prime is 28387787. The next prime is 28387861. The reversal of 28387842 is 24878382.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a junction number, because it is equal to n+sod(n) for n = 28387794 and 28387803.

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, 13728 + ... + 15659.

It is an arithmetic number, because the mean of its divisors is an integer number (2115936).

Almost surely, 2^28387842 is an apocalyptic number.

28387842 is an abundant number, since it is smaller than the sum of its proper divisors (39322110).

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

28387842 is a wasteful number, since it uses less digits than its factorization.

28387842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29422.

The product of its digits is 172032, while the sum is 42.

The square root of 28387842 is about 5328.0242116567. The cubic root of 28387842 is about 305.0545168158.

The spelling of 28387842 in words is "twenty-eight million, three hundred eighty-seven thousand, eight hundred forty-two".