28556040 has 32 divisors (see below), whose sum is σ = 85668480. Its totient is φ = 7614912.

The previous prime is 28556027. The next prime is 28556081. The reversal of 28556040 is 4065582.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 28555989 and 28556007.

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 7 ways as a sum of consecutive naturals, for example, 118864 + ... + 119103.

It is an arithmetic number, because the mean of its divisors is an integer number (2677140).

Almost surely, 2^28556040 is an apocalyptic number.

28556040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28556040 is an abundant number, since it is smaller than the sum of its proper divisors (57112440).

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

28556040 is a wasteful number, since it uses less digits than its factorization.

28556040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 237981 (or 237977 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 30.

The square root of 28556040 is about 5343.7851753228. The cubic root of 28556040 is about 305.6558136136.

The spelling of 28556040 in words is "twenty-eight million, five hundred fifty-six thousand, forty".