28040684 has 24 divisors (see below), whose sum is σ = 59381280. Its totient is φ = 11310336.

The previous prime is 28040659. The next prime is 28040699. The reversal of 28040684 is 48604082.

28040684 = T₄₁₉ + T₄₂₀ + ... + T₆₂₂.

It is a self number, because there is not a number n which added to its sum of digits gives 28040684.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28979 + ... + 29930.

It is an arithmetic number, because the mean of its divisors is an integer number (2474220).

Almost surely, 2^28040684 is an apocalyptic number.

It is an amenable number.

28040684 is an abundant number, since it is smaller than the sum of its proper divisors (31340596).

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

28040684 is a wasteful number, since it uses less digits than its factorization.

28040684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58937 (or 58935 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 32.

The square root of 28040684 is about 5295.3455033643. The cubic root of 28040684 is about 303.8058981389.

The spelling of 28040684 in words is "twenty-eight million, forty thousand, six hundred eighty-four".