28626891 has 8 divisors (see below), whose sum is σ = 38193984. Its totient is φ = 19072200.

The previous prime is 28626869. The next prime is 28626907. The reversal of 28626891 is 19862682.

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

It is not a de Polignac number, because 28626891 - 2¹⁸ = 28364747 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28626821) 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, 6880 + ... + 10226.

It is an arithmetic number, because the mean of its divisors is an integer number (4774248).

Almost surely, 2^28626891 is an apocalyptic number.

28626891 is a deficient number, since it is larger than the sum of its proper divisors (9567093).

28626891 is a wasteful number, since it uses less digits than its factorization.

28626891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6201.

The product of its digits is 82944, while the sum is 42.

The square root of 28626891 is about 5350.4103580940. The cubic root of 28626891 is about 305.9083945538.

The spelling of 28626891 in words is "twenty-eight million, six hundred twenty-six thousand, eight hundred ninety-one".