28997527 has 6 divisors (see below), whose sum is σ = 31399872. Its totient is φ = 26766792.

The previous prime is 28997491. The next prime is 28997531. The reversal of 28997527 is 72579982.

It is a de Polignac number, because none of the positive numbers 2^k-28997527 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28997027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 85623 + ... + 85960.

It is an arithmetic number, because the mean of its divisors is an integer number (5233312).

Almost surely, 2^28997527 is an apocalyptic number.

28997527 is a deficient number, since it is larger than the sum of its proper divisors (2402345).

28997527 is a wasteful number, since it uses less digits than its factorization.

28997527 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171609 (or 171596 counting only the distinct ones).

The product of its digits is 635040, while the sum is 49.

The square root of 28997527 is about 5384.9351899535. The cubic root of 28997527 is about 307.2229491715. Note that the first 3 decimals are identical.

The spelling of 28997527 in words is "twenty-eight million, nine hundred ninety-seven thousand, five hundred twenty-seven".