28771523 has 4 divisors (see below), whose sum is σ = 31387128. Its totient is φ = 26155920.

The previous prime is 28771517. The next prime is 28771541. The reversal of 28771523 is 32517782.

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-28771523 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28771553) 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, 1307786 + ... + 1307807.

It is an arithmetic number, because the mean of its divisors is an integer number (7846782).

Almost surely, 2^28771523 is an apocalyptic number.

28771523 is a deficient number, since it is larger than the sum of its proper divisors (2615605).

28771523 is a wasteful number, since it uses less digits than its factorization.

28771523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2615604.

The product of its digits is 23520, while the sum is 35.

The square root of 28771523 is about 5363.9093019923. The cubic root of 28771523 is about 306.4227109660.

The spelling of 28771523 in words is "twenty-eight million, seven hundred seventy-one thousand, five hundred twenty-three".