28505394 has 24 divisors (see below), whose sum is σ = 61932780. Its totient is φ = 9475488.

The previous prime is 28505387. The next prime is 28505401. The reversal of 28505394 is 49350582.

It is an interprime number because it is at equal distance from previous prime (28505387) and next prime (28505401).

It can be written as a sum of positive squares in 2 ways, for example, as 28355625 + 149769 = 5325^2 + 387^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5152 + ... + 9140.

Almost surely, 2^28505394 is an apocalyptic number.

28505394 is an abundant number, since it is smaller than the sum of its proper divisors (33427386).

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

28505394 is a wasteful number, since it uses less digits than its factorization.

28505394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4394 (or 4391 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 36.

The square root of 28505394 is about 5339.0442965010. The cubic root of 28505394 is about 305.4750065047.

The spelling of 28505394 in words is "twenty-eight million, five hundred five thousand, three hundred ninety-four".