28198877 has 8 divisors (see below), whose sum is σ = 32345856. Its totient is φ = 24081552.

The previous prime is 28198853. The next prime is 28198931. The reversal of 28198877 is 77889182.

It is a happy number.

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 28198877 - 2²⁰ = 27150301 is a prime.

It is a super-2 number, since 2×28198877² = 1590353328122258, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28197877) 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, 5333 + ... + 9210.

It is an arithmetic number, because the mean of its divisors is an integer number (4043232).

Almost surely, 2^28198877 is an apocalyptic number.

It is an amenable number.

28198877 is a deficient number, since it is larger than the sum of its proper divisors (4146979).

28198877 is a wasteful number, since it uses less digits than its factorization.

28198877 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14827.

The product of its digits is 451584, while the sum is 50.

The square root of 28198877 is about 5310.2614813209. The cubic root of 28198877 is about 304.3761394715.

The spelling of 28198877 in words is "twenty-eight million, one hundred ninety-eight thousand, eight hundred seventy-seven".