28991477 has 16 divisors (see below), whose sum is σ = 32659200. Its totient is φ = 25588992.

The previous prime is 28991467. The next prime is 28991489. The reversal of 28991477 is 77419982.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28991477 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 (28991407) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20024 + ... + 21422.

It is an arithmetic number, because the mean of its divisors is an integer number (2041200).

Almost surely, 2^28991477 is an apocalyptic number.

It is an amenable number.

28991477 is a deficient number, since it is larger than the sum of its proper divisors (3667723).

28991477 is a wasteful number, since it uses less digits than its factorization.

28991477 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1492.

The product of its digits is 254016, while the sum is 47.

The square root of 28991477 is about 5384.3734082992. The cubic root of 28991477 is about 307.2015815088.

The spelling of 28991477 in words is "twenty-eight million, nine hundred ninety-one thousand, four hundred seventy-seven".