28582440 has 64 divisors (see below), whose sum is σ = 90797760. Its totient is φ = 7173120.

The previous prime is 28582427. The next prime is 28582451. The reversal of 28582440 is 4428582.

It is a happy number.

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, 4966 + ... + 9045.

It is an arithmetic number, because the mean of its divisors is an integer number (1418715).

Almost surely, 2^28582440 is an apocalyptic number.

28582440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28582440 is an abundant number, since it is smaller than the sum of its proper divisors (62215320).

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

28582440 is a wasteful number, since it uses less digits than its factorization.

28582440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14042 (or 14038 counting only the distinct ones).

The product of its (nonzero) digits is 20480, while the sum is 33.

The square root of 28582440 is about 5346.2547638510. The cubic root of 28582440 is about 305.7499773243.

The spelling of 28582440 in words is "twenty-eight million, five hundred eighty-two thousand, four hundred forty".