28415567 has 4 divisors (see below), whose sum is σ = 28426320. Its totient is φ = 28404816.

The previous prime is 28415539. The next prime is 28415617. The reversal of 28415567 is 76551482.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 28415567 - 2⁸ = 28415311 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28415567.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28415467) 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, 1643 + ... + 7715.

It is an arithmetic number, because the mean of its divisors is an integer number (7106580).

Almost surely, 2^28415567 is an apocalyptic number.

28415567 is a deficient number, since it is larger than the sum of its proper divisors (10753).

28415567 is an equidigital number, since it uses as much as digits as its factorization.

28415567 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10752.

The product of its digits is 67200, while the sum is 38.

The square root of 28415567 is about 5330.6253854496. The cubic root of 28415567 is about 305.1537950513.

It can be divided in two parts, 28415 and 567, that added together give a palindrome (28982).

The spelling of 28415567 in words is "twenty-eight million, four hundred fifteen thousand, five hundred sixty-seven".