28994647 has 4 divisors (see below), whose sum is σ = 31630536. Its totient is φ = 26358760.

The previous prime is 28994621. The next prime is 28994653. The reversal of 28994647 is 74649982.

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

It is a cyclic number.

It is not a de Polignac number, because 28994647 - 2¹⁵ = 28961879 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 28994647.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28994617) 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, 1317928 + ... + 1317949.

It is an arithmetic number, because the mean of its divisors is an integer number (7907634).

Almost surely, 2^28994647 is an apocalyptic number.

28994647 is a deficient number, since it is larger than the sum of its proper divisors (2635889).

28994647 is a wasteful number, since it uses less digits than its factorization.

28994647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2635888.

The product of its digits is 870912, while the sum is 49.

The square root of 28994647 is about 5384.6677706243. The cubic root of 28994647 is about 307.2127778284.

The spelling of 28994647 in words is "twenty-eight million, nine hundred ninety-four thousand, six hundred forty-seven".