28223040 has 56 divisors (see below), whose sum is σ = 89611200. Its totient is φ = 7525888.

The previous prime is 28223021. The next prime is 28223059. The reversal of 28223040 is 4032282.

It is an interprime number because it is at equal distance from previous prime (28223021) and next prime (28223059).

It is a junction number, because it is equal to n+sod(n) for n = 28222998 and 28223016.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13740 + ... + 15659.

It is an arithmetic number, because the mean of its divisors is an integer number (1600200).

Almost surely, 2^28223040 is an apocalyptic number.

28223040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28223040 is an abundant number, since it is smaller than the sum of its proper divisors (61388160).

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

28223040 is a wasteful number, since it uses less digits than its factorization.

28223040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29419 (or 29409 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 28223040 is about 5312.5361175243. The cubic root of 28223040 is about 304.4630524005.

The spelling of 28223040 in words is "twenty-eight million, two hundred twenty-three thousand, forty".