28456740 has 72 divisors (see below), whose sum is σ = 92966328. Its totient is φ = 7004160.

The previous prime is 28456717. The next prime is 28456741. The reversal of 28456740 is 4765482.

It can be written as a sum of positive squares in 4 ways, for example, as 5184 + 28451556 = 72^2 + 5334^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 28456695 and 28456704.

It is not an unprimeable number, because it can be changed into a prime (28456741) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3741 + ... + 8420.

It is an arithmetic number, because the mean of its divisors is an integer number (1291199).

Almost surely, 2^28456740 is an apocalyptic number.

28456740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28456740 is an abundant number, since it is smaller than the sum of its proper divisors (64509588).

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

28456740 is a wasteful number, since it uses less digits than its factorization.

28456740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12189 (or 12184 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 36.

The square root of 28456740 is about 5334.4859171245. The cubic root of 28456740 is about 305.3011090664.

The spelling of 28456740 in words is "twenty-eight million, four hundred fifty-six thousand, seven hundred forty".