28744880 has 20 divisors (see below), whose sum is σ = 66832032. Its totient is φ = 11497920.

The previous prime is 28744879. The next prime is 28744889. The reversal of 28744880 is 8844782.

It is a tau number, because it is divible by the number of its divisors (20).

It is not an unprimeable number, because it can be changed into a prime (28744889) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 179576 + ... + 179735.

Almost surely, 2^28744880 is an apocalyptic number.

28744880 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28744880 is an abundant number, since it is smaller than the sum of its proper divisors (38087152).

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

28744880 is a wasteful number, since it uses less digits than its factorization.

28744880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 359324 (or 359318 counting only the distinct ones).

The product of its (nonzero) digits is 114688, while the sum is 41.

The square root of 28744880 is about 5361.4251836615. The cubic root of 28744880 is about 306.3280972560.

The spelling of 28744880 in words is "twenty-eight million, seven hundred forty-four thousand, eight hundred eighty".