28397511 has 12 divisors (see below), whose sum is σ = 41581488. Its totient is φ = 18671904.

The previous prime is 28397507. The next prime is 28397527. The reversal of 28397511 is 11579382.

It is not a de Polignac number, because 28397511 - 2² = 28397507 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28397311) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20955 + ... + 22268.

It is an arithmetic number, because the mean of its divisors is an integer number (3465124).

Almost surely, 2^28397511 is an apocalyptic number.

28397511 is a deficient number, since it is larger than the sum of its proper divisors (13183977).

28397511 is a wasteful number, since it uses less digits than its factorization.

28397511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43302 (or 43299 counting only the distinct ones).

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

The square root of 28397511 is about 5328.9315064091. The cubic root of 28397511 is about 305.0891471024.

The spelling of 28397511 in words is "twenty-eight million, three hundred ninety-seven thousand, five hundred eleven".