28740440 has 16 divisors (see below), whose sum is σ = 64666080. Its totient is φ = 11496160.

The previous prime is 28740433. The next prime is 28740451. The reversal of 28740440 is 4404782.

It is a congruent number.

It is an unprimeable number.

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, 359216 + ... + 359295.

It is an arithmetic number, because the mean of its divisors is an integer number (4041630).

Almost surely, 2^28740440 is an apocalyptic number.

28740440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28740440 is an abundant number, since it is smaller than the sum of its proper divisors (35925640).

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

28740440 is a wasteful number, since it uses less digits than its factorization.

28740440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 718522 (or 718518 counting only the distinct ones).

The product of its (nonzero) digits is 7168, while the sum is 29.

The square root of 28740440 is about 5361.0110986641. The cubic root of 28740440 is about 306.3123243974.

The spelling of 28740440 in words is "twenty-eight million, seven hundred forty thousand, four hundred forty".