28424940 has 48 divisors (see below), whose sum is σ = 79978752. Its totient is φ = 7542976.

The previous prime is 28424899. The next prime is 28424947. The reversal of 28424940 is 4942482.

It is not an unprimeable number, because it can be changed into a prime (28424947) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12577 + ... + 14663.

It is an arithmetic number, because the mean of its divisors is an integer number (1666224).

Almost surely, 2^28424940 is an apocalyptic number.

28424940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28424940 is an abundant number, since it is smaller than the sum of its proper divisors (51553812).

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

28424940 is a wasteful number, since it uses less digits than its factorization.

28424940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2326 (or 2324 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 33.

The square root of 28424940 is about 5331.5044781000. The cubic root of 28424940 is about 305.1873434709.

The spelling of 28424940 in words is "twenty-eight million, four hundred twenty-four thousand, nine hundred forty".