28696667 has 4 divisors (see below), whose sum is σ = 28767240. Its totient is φ = 28626096.

The previous prime is 28696643. The next prime is 28696687. The reversal of 28696667 is 76669682.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 76669682 = 2 ⋅38334841.

It is a cyclic number.

It is not a de Polignac number, because 28696667 - 2²⁰ = 27648091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28696627) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34673 + ... + 35490.

It is an arithmetic number, because the mean of its divisors is an integer number (7191810).

Almost surely, 2^28696667 is an apocalyptic number.

28696667 is a deficient number, since it is larger than the sum of its proper divisors (70573).

28696667 is an equidigital number, since it uses as much as digits as its factorization.

28696667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70572.

The product of its digits is 1306368, while the sum is 50.

The square root of 28696667 is about 5356.9270108897. The cubic root of 28696667 is about 306.1567361711.

The spelling of 28696667 in words is "twenty-eight million, six hundred ninety-six thousand, six hundred sixty-seven".