28942861 has 4 divisors (see below), whose sum is σ = 29374912. Its totient is φ = 28510812.

The previous prime is 28942829. The next prime is 28942867. The reversal of 28942861 is 16824982.

28942861 = T₄₃₃ + T₄₃₄ + ... + T₆₃₃.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28942861 - 2⁵ = 28942829 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 (28942867) 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, 215925 + ... + 216058.

It is an arithmetic number, because the mean of its divisors is an integer number (7343728).

Almost surely, 2^28942861 is an apocalyptic number.

It is an amenable number.

28942861 is a deficient number, since it is larger than the sum of its proper divisors (432051).

28942861 is an equidigital number, since it uses as much as digits as its factorization.

28942861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 432050.

The product of its digits is 55296, while the sum is 40.

The square root of 28942861 is about 5379.8569683589. The cubic root of 28942861 is about 307.0297693124.

The spelling of 28942861 in words is "twenty-eight million, nine hundred forty-two thousand, eight hundred sixty-one".