28781038 has 24 divisors (see below), whose sum is σ = 51004296. Its totient is φ = 12074400.

The previous prime is 28781023. The next prime is 28781041. The reversal of 28781038 is 83018782.

It is a junction number, because it is equal to n+sod(n) for n = 28780988 and 28781006.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 153 + ... + 7588.

It is an arithmetic number, because the mean of its divisors is an integer number (2125179).

Almost surely, 2^28781038 is an apocalyptic number.

28781038 is a deficient number, since it is larger than the sum of its proper divisors (22223258).

28781038 is a wasteful number, since it uses less digits than its factorization.

28781038 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7780 (or 7767 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 37.

The square root of 28781038 is about 5364.7961750657. The cubic root of 28781038 is about 306.4564861535.

It can be divided in two parts, 2878 and 1038, that added together give a triangular number (3916 = T₈₈).

The spelling of 28781038 in words is "twenty-eight million, seven hundred eighty-one thousand, thirty-eight".