28748940 has 96 divisors (see below), whose sum is σ = 89945856. Its totient is φ = 6800640.

The previous prime is 28748939. The next prime is 28748971. The reversal of 28748940 is 4984782.

It is a super-2 number, since 2×28748940² = 1653003102247200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28748892 and 28748901.

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 31 ways as a sum of consecutive naturals, for example, 27874 + ... + 28886.

It is an arithmetic number, because the mean of its divisors is an integer number (936936).

Almost surely, 2^28748940 is an apocalyptic number.

28748940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28748940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44972928).

28748940 is an abundant number, since it is smaller than the sum of its proper divisors (61196916).

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

28748940 is a wasteful number, since it uses less digits than its factorization.

28748940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1079 (or 1077 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 42.

The square root of 28748940 is about 5361.8038009610. The cubic root of 28748940 is about 306.3425187637.

The spelling of 28748940 in words is "twenty-eight million, seven hundred forty-eight thousand, nine hundred forty".