28863880 has 16 divisors (see below), whose sum is σ = 64943820. Its totient is φ = 11545536.

The previous prime is 28863871. The next prime is 28863893. The reversal of 28863880 is 8836882.

It can be written as a sum of positive squares in 2 ways, for example, as 26193924 + 2669956 = 5118^2 + 1634^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 360759 + ... + 360838.

Almost surely, 2^28863880 is an apocalyptic number.

28863880 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28863880 is an abundant number, since it is smaller than the sum of its proper divisors (36079940).

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

28863880 is a wasteful number, since it uses less digits than its factorization.

28863880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 721608 (or 721604 counting only the distinct ones).

The product of its (nonzero) digits is 147456, while the sum is 43.

The square root of 28863880 is about 5372.5115169723. The cubic root of 28863880 is about 306.7502345243.

The spelling of 28863880 in words is "twenty-eight million, eight hundred sixty-three thousand, eight hundred eighty".