28780302 has 16 divisors (see below), whose sum is σ = 59116752. Its totient is φ = 9334080.

The previous prime is 28780289. The next prime is 28780313. The reversal of 28780302 is 20308782.

It is a super-2 number, since 2×28780302² = 1656611566422408, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 28780302.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 64599 + ... + 65042.

It is an arithmetic number, because the mean of its divisors is an integer number (3694797).

Almost surely, 2^28780302 is an apocalyptic number.

28780302 is an abundant number, since it is smaller than the sum of its proper divisors (30336450).

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

28780302 is a wasteful number, since it uses less digits than its factorization.

28780302 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129683.

The product of its (nonzero) digits is 5376, while the sum is 30.

The square root of 28780302 is about 5364.7275792905. The cubic root of 28780302 is about 306.4538738560.

The spelling of 28780302 in words is "twenty-eight million, seven hundred eighty thousand, three hundred two".