28772571 has 4 divisors (see below), whose sum is σ = 38363432. Its totient is φ = 19181712.

The previous prime is 28772539. The next prime is 28772581. The reversal of 28772571 is 17527782.

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

It is not a de Polignac number, because 28772571 - 2⁵ = 28772539 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28772521) 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, 4795426 + ... + 4795431.

It is an arithmetic number, because the mean of its divisors is an integer number (9590858).

Almost surely, 2^28772571 is an apocalyptic number.

28772571 is a deficient number, since it is larger than the sum of its proper divisors (9590861).

28772571 is an equidigital number, since it uses as much as digits as its factorization.

28772571 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9590860.

The product of its digits is 54880, while the sum is 39.

The square root of 28772571 is about 5364.0069910469. The cubic root of 28772571 is about 306.4264313936.

The spelling of 28772571 in words is "twenty-eight million, seven hundred seventy-two thousand, five hundred seventy-one".