28523940 has 96 divisors (see below), whose sum is σ = 85155840. Its totient is φ = 7113600.

The previous prime is 28523939. The next prime is 28523969. The reversal of 28523940 is 4932582.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 149245 + ... + 149435.

It is an arithmetic number, because the mean of its divisors is an integer number (887040).

Almost surely, 2^28523940 is an apocalyptic number.

28523940 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 28523940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42577920).

28523940 is an abundant number, since it is smaller than the sum of its proper divisors (56631900).

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

28523940 is a wasteful number, since it uses less digits than its factorization.

28523940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 353 (or 351 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 33.

The square root of 28523940 is about 5340.7808417871. The cubic root of 28523940 is about 305.5412408843.

The spelling of 28523940 in words is "twenty-eight million, five hundred twenty-three thousand, nine hundred forty".