28776140 has 48 divisors (see below), whose sum is σ = 62287680. Its totient is φ = 11162880.

The previous prime is 28776133. The next prime is 28776157. The reversal of 28776140 is 4167782.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 28776140.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 125546 + ... + 125774.

It is an arithmetic number, because the mean of its divisors is an integer number (1297660).

Almost surely, 2^28776140 is an apocalyptic number.

28776140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28776140 is an abundant number, since it is smaller than the sum of its proper divisors (33511540).

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

28776140 is a wasteful number, since it uses less digits than its factorization.

28776140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 402 (or 400 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 35.

The square root of 28776140 is about 5364.3396611326. The cubic root of 28776140 is about 306.4391007598.

The spelling of 28776140 in words is "twenty-eight million, seven hundred seventy-six thousand, one hundred forty".