28607840 has 24 divisors (see below), whose sum is σ = 67586400. Its totient is φ = 11443072.

The previous prime is 28607809. The next prime is 28607867. The reversal of 28607840 is 4870682.

It is a self number, because there is not a number n which added to its sum of digits gives 28607840.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 89240 + ... + 89559.

It is an arithmetic number, because the mean of its divisors is an integer number (2816100).

Almost surely, 2^28607840 is an apocalyptic number.

28607840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28607840 is an abundant number, since it is smaller than the sum of its proper divisors (38978560).

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

28607840 is a wasteful number, since it uses less digits than its factorization.

28607840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178814 (or 178806 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 35.

The square root of 28607840 is about 5348.6297310620. The cubic root of 28607840 is about 305.8405195139.

The spelling of 28607840 in words is "twenty-eight million, six hundred seven thousand, eight hundred forty".