28781415 has 24 divisors (see below), whose sum is σ = 53726400. Its totient is φ = 14169024.

The previous prime is 28781387. The next prime is 28781429. The reversal of 28781415 is 51418782.

It is not a de Polignac number, because 28781415 - 2⁹ = 28780903 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28781415.

It is a congruent number.

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, 24015 + ... + 25184.

It is an arithmetic number, because the mean of its divisors is an integer number (2238600).

Almost surely, 2^28781415 is an apocalyptic number.

28781415 is a deficient number, since it is larger than the sum of its proper divisors (24944985).

28781415 is a wasteful number, since it uses less digits than its factorization.

28781415 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49223 (or 49220 counting only the distinct ones).

The product of its digits is 17920, while the sum is 36.

The square root of 28781415 is about 5364.8313114207. The cubic root of 28781415 is about 306.4578242288.

The spelling of 28781415 in words is "twenty-eight million, seven hundred eighty-one thousand, four hundred fifteen".