28387776 has 28 divisors (see below), whose sum is σ = 75109832. Its totient is φ = 9462528.

The previous prime is 28387771. The next prime is 28387787. The reversal of 28387776 is 67778382.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28387771) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 73735 + ... + 74118.

It is an arithmetic number, because the mean of its divisors is an integer number (2682494).

Almost surely, 2^28387776 is an apocalyptic number.

It is an amenable number.

28387776 is an abundant number, since it is smaller than the sum of its proper divisors (46722056).

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

28387776 is a wasteful number, since it uses less digits than its factorization.

28387776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147868 (or 147858 counting only the distinct ones).

The product of its digits is 790272, while the sum is 48.

The square root of 28387776 is about 5328.0180179876. The cubic root of 28387776 is about 305.0542804046.

The spelling of 28387776 in words is "twenty-eight million, three hundred eighty-seven thousand, seven hundred seventy-six".