28081361 has 24 divisors (see below), whose sum is σ = 36345024. Its totient is φ = 21446880.

The previous prime is 28081337. The next prime is 28081387. The reversal of 28081361 is 16318082.

It is not a de Polignac number, because 28081361 - 2¹⁸ = 27819217 is a prime.

It is a super-2 number, since 2×28081361² = 1577125671224642, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28081961) 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, 28076 + ... + 29058.

It is an arithmetic number, because the mean of its divisors is an integer number (1514376).

Almost surely, 2^28081361 is an apocalyptic number.

It is an amenable number.

28081361 is a deficient number, since it is larger than the sum of its proper divisors (8263663).

28081361 is a wasteful number, since it uses less digits than its factorization.

28081361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1061 (or 1054 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 29.

The square root of 28081361 is about 5299.1849373276. The cubic root of 28081361 is about 303.9527317147.

The spelling of 28081361 in words is "twenty-eight million, eighty-one thousand, three hundred sixty-one".