28746440 has 16 divisors (see below), whose sum is σ = 64679580. Its totient is φ = 11498560.

The previous prime is 28746427. The next prime is 28746463. The reversal of 28746440 is 4464782.

It can be written as a sum of positive squares in 2 ways, for example, as 27478564 + 1267876 = 5242^2 + 1126^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 28746440.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 359291 + ... + 359370.

Almost surely, 2^28746440 is an apocalyptic number.

28746440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28746440 is an abundant number, since it is smaller than the sum of its proper divisors (35933140).

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

28746440 is a wasteful number, since it uses less digits than its factorization.

28746440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 718672 (or 718668 counting only the distinct ones).

The product of its (nonzero) digits is 43008, while the sum is 35.

The square root of 28746440 is about 5361.5706653927. The cubic root of 28746440 is about 306.3336386856. Note that the first 3 decimals are identical.

The spelling of 28746440 in words is "twenty-eight million, seven hundred forty-six thousand, four hundred forty".