28516380 has 24 divisors (see below), whose sum is σ = 79846032. Its totient is φ = 7604352.

The previous prime is 28516349. The next prime is 28516391. The reversal of 28516380 is 8361582.

It is a happy number.

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, 237577 + ... + 237696.

It is an arithmetic number, because the mean of its divisors is an integer number (3326918).

Almost surely, 2^28516380 is an apocalyptic number.

28516380 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28516380 is an abundant number, since it is smaller than the sum of its proper divisors (51329652).

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

28516380 is a wasteful number, since it uses less digits than its factorization.

28516380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 475285 (or 475283 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 33.

The square root of 28516380 is about 5340.0730332084. The cubic root of 28516380 is about 305.5142448957.

The spelling of 28516380 in words is "twenty-eight million, five hundred sixteen thousand, three hundred eighty".