28572861 has 8 divisors (see below), whose sum is σ = 38139840. Its totient is φ = 19027232.

The previous prime is 28572847. The next prime is 28572871. The reversal of 28572861 is 16827582.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28572861 - 2¹⁸ = 28310717 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28572811) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1896 + ... + 7793.

It is an arithmetic number, because the mean of its divisors is an integer number (4767480).

Almost surely, 2^28572861 is an apocalyptic number.

It is an amenable number.

28572861 is a deficient number, since it is larger than the sum of its proper divisors (9566979).

28572861 is an equidigital number, since it uses as much as digits as its factorization.

28572861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10675.

The product of its digits is 53760, while the sum is 39.

The square root of 28572861 is about 5345.3588279927. The cubic root of 28572861 is about 305.7158175830.

The spelling of 28572861 in words is "twenty-eight million, five hundred seventy-two thousand, eight hundred sixty-one".