28119021 has 8 divisors (see below), whose sum is σ = 42848064. Its totient is φ = 16068000.

The previous prime is 28119017. The next prime is 28119043. The reversal of 28119021 is 12091182.

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

It is not a de Polignac number, because 28119021 - 2² = 28119017 is a prime.

It is a super-3 number, since 3×28119021³ (a number of 23 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28118982 and 28119000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28119121) 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, 669480 + ... + 669521.

It is an arithmetic number, because the mean of its divisors is an integer number (5356008).

Almost surely, 2^28119021 is an apocalyptic number.

28119021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

28119021 is a deficient number, since it is larger than the sum of its proper divisors (14729043).

28119021 is a wasteful number, since it uses less digits than its factorization.

28119021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1339011.

The product of its (nonzero) digits is 288, while the sum is 24.

The square root of 28119021 is about 5302.7371234109. The cubic root of 28119021 is about 304.0885483339.

The spelling of 28119021 in words is "twenty-eight million, one hundred nineteen thousand, twenty-one".