28780402 has 32 divisors (see below), whose sum is σ = 52260480. Its totient is φ = 11612160.

The previous prime is 28780397. The next prime is 28780417. The reversal of 28780402 is 20408782.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 68152 + ... + 68572.

It is an arithmetic number, because the mean of its divisors is an integer number (1633140).

Almost surely, 2^28780402 is an apocalyptic number.

28780402 is a deficient number, since it is larger than the sum of its proper divisors (23480078).

28780402 is a wasteful number, since it uses less digits than its factorization.

28780402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 706.

The product of its (nonzero) digits is 7168, while the sum is 31.

The square root of 28780402 is about 5364.7368994201. The cubic root of 28780402 is about 306.4542287903.

The spelling of 28780402 in words is "twenty-eight million, seven hundred eighty thousand, four hundred two".