28786878 has 12 divisors (see below), whose sum is σ = 62371608. Its totient is φ = 9595620.

The previous prime is 28786873. The next prime is 28786883. The reversal of 28786878 is 87868782.

It is an interprime number because it is at equal distance from previous prime (28786873) and next prime (28786883).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28786873) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 799618 + ... + 799653.

It is an arithmetic number, because the mean of its divisors is an integer number (5197634).

Almost surely, 2^28786878 is an apocalyptic number.

28786878 is an abundant number, since it is smaller than the sum of its proper divisors (33584730).

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

28786878 is a wasteful number, since it uses less digits than its factorization.

28786878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1599279 (or 1599276 counting only the distinct ones).

The product of its digits is 2408448, while the sum is 54.

The square root of 28786878 is about 5365.3404365427. The cubic root of 28786878 is about 306.4772125873.

The spelling of 28786878 in words is "twenty-eight million, seven hundred eighty-six thousand, eight hundred seventy-eight".