28408020 has 48 divisors (see below), whose sum is σ = 84224448. Its totient is φ = 7129600.

The previous prime is 28408007. The next prime is 28408031. The reversal of 28408020 is 2080482.

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 15 ways as a sum of consecutive naturals, for example, 12906 + ... + 14945.

It is an arithmetic number, because the mean of its divisors is an integer number (1754676).

Almost surely, 2^28408020 is an apocalyptic number.

28408020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28408020 is an abundant number, since it is smaller than the sum of its proper divisors (55816428).

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

28408020 is a wasteful number, since it uses less digits than its factorization.

28408020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27880 (or 27878 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 24.

The square root of 28408020 is about 5329.9174477660. The cubic root of 28408020 is about 305.1267770016.

The spelling of 28408020 in words is "twenty-eight million, four hundred eight thousand, twenty".