28702780 has 12 divisors (see below), whose sum is σ = 60275880. Its totient is φ = 11481104.

The previous prime is 28702771. The next prime is 28702789. The reversal of 28702780 is 8720782.

It is an interprime number because it is at equal distance from previous prime (28702771) and next prime (28702789).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28702789) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 717550 + ... + 717589.

It is an arithmetic number, because the mean of its divisors is an integer number (5022990).

Almost surely, 2^28702780 is an apocalyptic number.

28702780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28702780 is an abundant number, since it is smaller than the sum of its proper divisors (31573100).

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

28702780 is a wasteful number, since it uses less digits than its factorization.

28702780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1435148 (or 1435146 counting only the distinct ones).

The product of its (nonzero) digits is 12544, while the sum is 34.

The square root of 28702780 is about 5357.4975501628. The cubic root of 28702780 is about 306.1784739250.

The spelling of 28702780 in words is "twenty-eight million, seven hundred two thousand, seven hundred eighty".