28028877 has 8 divisors (see below), whose sum is σ = 38660640. Its totient is φ = 18041520.

The previous prime is 28028863. The next prime is 28028879. The reversal of 28028877 is 77882082.

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

It is not a de Polignac number, because 28028877 - 2¹⁵ = 27996109 is a prime.

It is a super-2 number, since 2×28028877² = 1571235891762258, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28028879) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 160999 + ... + 161172.

It is an arithmetic number, because the mean of its divisors is an integer number (4832580).

Almost surely, 2^28028877 is an apocalyptic number.

It is an amenable number.

28028877 is a deficient number, since it is larger than the sum of its proper divisors (10631763).

28028877 is a wasteful number, since it uses less digits than its factorization.

28028877 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 322203.

The product of its (nonzero) digits is 100352, while the sum is 42.

The square root of 28028877 is about 5294.2305389924. The cubic root of 28028877 is about 303.7632512975.

The spelling of 28028877 in words is "twenty-eight million, twenty-eight thousand, eight hundred seventy-seven".