28697517 has 8 divisors (see below), whose sum is σ = 42514880. Its totient is φ = 19131660.

The previous prime is 28697509. The next prime is 28697519. The reversal of 28697517 is 71579682.

It is not a de Polignac number, because 28697517 - 2³ = 28697509 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 (28697519) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 531409 + ... + 531462.

It is an arithmetic number, because the mean of its divisors is an integer number (5314360).

Almost surely, 2^28697517 is an apocalyptic number.

28697517 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

28697517 is a deficient number, since it is larger than the sum of its proper divisors (13817363).

28697517 is a wasteful number, since it uses less digits than its factorization.

28697517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1062880 (or 1062874 counting only the distinct ones).

The product of its digits is 211680, while the sum is 45.

The square root of 28697517 is about 5357.0063468322. The cubic root of 28697517 is about 306.1597589456.

The spelling of 28697517 in words is "twenty-eight million, six hundred ninety-seven thousand, five hundred seventeen".