28888858 has 4 divisors (see below), whose sum is σ = 43333290. Its totient is φ = 14444428.

The previous prime is 28888841. The next prime is 28888877. The reversal of 28888858 is 85888882.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 85888882 = 2 ⋅42944441.

It can be written as a sum of positive squares in only one way, i.e., 20403289 + 8485569 = 4517^2 + 2913^2 .

It is a super-2 number, since 2×28888858² = 1669132233088328, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28888799 and 28888808.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7222213 + ... + 7222216.

Almost surely, 2^28888858 is an apocalyptic number.

28888858 is a deficient number, since it is larger than the sum of its proper divisors (14444432).

28888858 is a wasteful number, since it uses less digits than its factorization.

28888858 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14444431.

The product of its digits is 2621440, while the sum is 55.

The square root of 28888858 is about 5374.8356253936. The cubic root of 28888858 is about 306.8386933900.

The spelling of 28888858 in words is "twenty-eight million, eight hundred eighty-eight thousand, eight hundred fifty-eight".