28646840 has 16 divisors (see below), whose sum is σ = 64455480. Its totient is φ = 11458720.

The previous prime is 28646833. The next prime is 28646857. The reversal of 28646840 is 4864682.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 28646794 and 28646803.

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, 358046 + ... + 358125.

Almost surely, 2^28646840 is an apocalyptic number.

28646840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28646840 is an abundant number, since it is smaller than the sum of its proper divisors (35808640).

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

28646840 is a wasteful number, since it uses less digits than its factorization.

28646840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 716182 (or 716178 counting only the distinct ones).

The product of its (nonzero) digits is 73728, while the sum is 38.

The square root of 28646840 is about 5352.2742829567. The cubic root of 28646840 is about 305.9794367260.

The spelling of 28646840 in words is "twenty-eight million, six hundred forty-six thousand, eight hundred forty".