28615667 has 4 divisors (see below), whose sum is σ = 28631400. Its totient is φ = 28599936.

The previous prime is 28615619. The next prime is 28615673. The reversal of 28615667 is 76651682.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28615667 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28615967) 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, 4718 + ... + 8915.

It is an arithmetic number, because the mean of its divisors is an integer number (7157850).

Almost surely, 2^28615667 is an apocalyptic number.

28615667 is a deficient number, since it is larger than the sum of its proper divisors (15733).

28615667 is a wasteful number, since it uses less digits than its factorization.

28615667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15732.

The product of its digits is 120960, while the sum is 41.

The square root of 28615667 is about 5349.3613637518. The cubic root of 28615667 is about 305.8684092517.

The spelling of 28615667 in words is "twenty-eight million, six hundred fifteen thousand, six hundred sixty-seven".