28735040 has 28 divisors (see below), whose sum is σ = 68426076. Its totient is φ = 11493888.

The previous prime is 28735039. The next prime is 28735079. The reversal of 28735040 is 4053782.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 7795264 + 20939776 = 2792^2 + 4576^2 .

It is a junction number, because it is equal to n+sod(n) for n = 28734994 and 28735012.

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, 44579 + ... + 45218.

Almost surely, 2^28735040 is an apocalyptic number.

28735040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28735040 is an abundant number, since it is smaller than the sum of its proper divisors (39691036).

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

28735040 is an equidigital number, since it uses as much as digits as its factorization.

28735040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89814 (or 89804 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 29.

The square root of 28735040 is about 5360.5074386666. The cubic root of 28735040 is about 306.2931390015.

The spelling of 28735040 in words is "twenty-eight million, seven hundred thirty-five thousand, forty".