28973711 has 4 divisors (see below), whose sum is σ = 31202472. Its totient is φ = 26744952.

The previous prime is 28973699. The next prime is 28973713. The reversal of 28973711 is 11737982.

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

It is not a de Polignac number, because 28973711 - 2²² = 24779407 is a prime.

It is a super-2 number, since 2×28973711² = 1678951858223042, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28973713) 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, 1114361 + ... + 1114386.

It is an arithmetic number, because the mean of its divisors is an integer number (7800618).

Almost surely, 2^28973711 is an apocalyptic number.

28973711 is a deficient number, since it is larger than the sum of its proper divisors (2228761).

28973711 is a wasteful number, since it uses less digits than its factorization.

28973711 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2228760.

The product of its digits is 21168, while the sum is 38.

The square root of 28973711 is about 5382.7233813377. The cubic root of 28973711 is about 307.1388175626.

The spelling of 28973711 in words is "twenty-eight million, nine hundred seventy-three thousand, seven hundred eleven".