28397115 has 32 divisors (see below), whose sum is σ = 53145600. Its totient is φ = 14346720.

The previous prime is 28397107. The next prime is 28397129. The reversal of 28397115 is 51179382.

It is not a de Polignac number, because 28397115 - 2³ = 28397107 is a prime.

It is a super-2 number, since 2×28397115² = 1612792280646450, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 28397115.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2971 + ... + 8100.

It is an arithmetic number, because the mean of its divisors is an integer number (1660800).

Almost surely, 2^28397115 is an apocalyptic number.

28397115 is a deficient number, since it is larger than the sum of its proper divisors (24748485).

28397115 is a wasteful number, since it uses less digits than its factorization.

28397115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11104 (or 11098 counting only the distinct ones).

The product of its digits is 15120, while the sum is 36.

The square root of 28397115 is about 5328.8943506135. The cubic root of 28397115 is about 305.0877289515.

The spelling of 28397115 in words is "twenty-eight million, three hundred ninety-seven thousand, one hundred fifteen".