28690840 has 16 divisors (see below), whose sum is σ = 64554480. Its totient is φ = 11476320.

The previous prime is 28690819. The next prime is 28690877. The reversal of 28690840 is 4809682.

It is a self number, because there is not a number n which added to its sum of digits gives 28690840.

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 3 ways as a sum of consecutive naturals, for example, 358596 + ... + 358675.

It is an arithmetic number, because the mean of its divisors is an integer number (4034655).

Almost surely, 2^28690840 is an apocalyptic number.

28690840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28690840 is an abundant number, since it is smaller than the sum of its proper divisors (35863640).

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

28690840 is a wasteful number, since it uses less digits than its factorization.

28690840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 717282 (or 717278 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 37.

The square root of 28690840 is about 5356.3831080310. The cubic root of 28690840 is about 306.1360125558.

The spelling of 28690840 in words is "twenty-eight million, six hundred ninety thousand, eight hundred forty".