28780680 has 64 divisors (see below), whose sum is σ = 86708160. Its totient is φ = 7642368.

The previous prime is 28780669. The next prime is 28780681. The reversal of 28780680 is 8608782.

It is not an unprimeable number, because it can be changed into a prime (28780681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44439 + ... + 45081.

It is an arithmetic number, because the mean of its divisors is an integer number (1354815).

Almost surely, 2^28780680 is an apocalyptic number.

28780680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28780680 is an abundant number, since it is smaller than the sum of its proper divisors (57927480).

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

28780680 is a wasteful number, since it uses less digits than its factorization.

28780680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1030 (or 1026 counting only the distinct ones).

The product of its (nonzero) digits is 43008, while the sum is 39.

The square root of 28780680 is about 5364.7628092955. The cubic root of 28780680 is about 306.4552155035.

The spelling of 28780680 in words is "twenty-eight million, seven hundred eighty thousand, six hundred eighty".