28457660 has 96 divisors (see below), whose sum is σ = 78962688. Its totient is φ = 8340480.

The previous prime is 28457641. The next prime is 28457669. The reversal of 28457660 is 6675482.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28457669) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 25637 + ... + 26723.

It is an arithmetic number, because the mean of its divisors is an integer number (822528).

Almost surely, 2^28457660 is an apocalyptic number.

28457660 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 28457660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39481344).

28457660 is an abundant number, since it is smaller than the sum of its proper divisors (50505028).

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

28457660 is a wasteful number, since it uses less digits than its factorization.

28457660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1131 (or 1129 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 38.

The square root of 28457660 is about 5334.5721477922. The cubic root of 28457660 is about 305.3043991363.

The spelling of 28457660 in words is "twenty-eight million, four hundred fifty-seven thousand, six hundred sixty".