28296381 has 16 divisors (see below), whose sum is σ = 40112064. Its totient is φ = 17681664.

The previous prime is 28296361. The next prime is 28296403. The reversal of 28296381 is 18369282.

It is a happy number.

It is not a de Polignac number, because 28296381 - 2⁵ = 28296349 is a prime.

It is a super-2 number, since 2×28296381² = 1601370355394322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28296361) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13126 + ... + 15128.

It is an arithmetic number, because the mean of its divisors is an integer number (2507004).

Almost surely, 2^28296381 is an apocalyptic number.

It is an amenable number.

28296381 is a deficient number, since it is larger than the sum of its proper divisors (11815683).

28296381 is a wasteful number, since it uses less digits than its factorization.

28296381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2300.

The product of its digits is 41472, while the sum is 39.

The square root of 28296381 is about 5319.4342744318. The cubic root of 28296381 is about 304.7265523698.

The spelling of 28296381 in words is "twenty-eight million, two hundred ninety-six thousand, three hundred eighty-one".