28616540 has 24 divisors (see below), whose sum is σ = 61720512. Its totient is φ = 11136960.

The previous prime is 28616521. The next prime is 28616569. The reversal of 28616540 is 4561682.

It is a junction number, because it is equal to n+sod(n) for n = 28616497 and 28616506.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18596 + ... + 20075.

It is an arithmetic number, because the mean of its divisors is an integer number (2571688).

Almost surely, 2^28616540 is an apocalyptic number.

28616540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28616540 is an abundant number, since it is smaller than the sum of its proper divisors (33103972).

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

28616540 is a wasteful number, since it uses less digits than its factorization.

28616540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38717 (or 38715 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 28616540 is about 5349.4429616550. The cubic root of 28616540 is about 305.8715196738.

The spelling of 28616540 in words is "twenty-eight million, six hundred sixteen thousand, five hundred forty".