28005426 has 40 divisors (see below), whose sum is σ = 66450780. Its totient is φ = 8785152.

The previous prime is 28005407. The next prime is 28005433. The reversal of 28005426 is 62450082.

It can be written as a sum of positive squares in 2 ways, for example, as 23532201 + 4473225 = 4851^2 + 2115^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 28005426.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 2331 + ... + 7838.

Almost surely, 2^28005426 is an apocalyptic number.

28005426 is an abundant number, since it is smaller than the sum of its proper divisors (38445354).

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

28005426 is a wasteful number, since it uses less digits than its factorization.

28005426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10200 (or 10191 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

The square root of 28005426 is about 5292.0153061003. The cubic root of 28005426 is about 303.6785108394.

The spelling of 28005426 in words is "twenty-eight million, five thousand, four hundred twenty-six".