28927940 has 12 divisors (see below), whose sum is σ = 60748716. Its totient is φ = 11571168.

The previous prime is 28927939. The next prime is 28927957. The reversal of 28927940 is 4972982.

It can be written as a sum of positive squares in 2 ways, for example, as 17422276 + 11505664 = 4174^2 + 3392^2 .

It is a hoax number, since the sum of its digits (41) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 723179 + ... + 723218.

It is an arithmetic number, because the mean of its divisors is an integer number (5062393).

Almost surely, 2^28927940 is an apocalyptic number.

28927940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28927940 is an abundant number, since it is smaller than the sum of its proper divisors (31820776).

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

28927940 is a wasteful number, since it uses less digits than its factorization.

28927940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1446406 (or 1446404 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 41.

The square root of 28927940 is about 5378.4700426794. The cubic root of 28927940 is about 306.9769989169.

The spelling of 28927940 in words is "twenty-eight million, nine hundred twenty-seven thousand, nine hundred forty".