28587540 has 48 divisors (see below), whose sum is σ = 84756672. Its totient is φ = 7174656.

The previous prime is 28587527. The next prime is 28587563. The reversal of 28587540 is 4578582.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12994 + ... + 15033.

It is an arithmetic number, because the mean of its divisors is an integer number (1765764).

Almost surely, 2^28587540 is an apocalyptic number.

28587540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28587540 is an abundant number, since it is smaller than the sum of its proper divisors (56169132).

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

28587540 is a wasteful number, since it uses less digits than its factorization.

28587540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28056 (or 28054 counting only the distinct ones).

The product of its (nonzero) digits is 89600, while the sum is 39.

The square root of 28587540 is about 5346.7317119900. The cubic root of 28587540 is about 305.7681613579.

The spelling of 28587540 in words is "twenty-eight million, five hundred eighty-seven thousand, five hundred forty".