28383131 has 8 divisors (see below), whose sum is σ = 34145280. Its totient is φ = 23047848.

The previous prime is 28383109. The next prime is 28383133. The reversal of 28383131 is 13138382.

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 28383131 - 2⁶ = 28383067 is a prime.

It is a super-2 number, since 2×28383131² = 1611204250726322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28383094 and 28383103.

It is not an unprimeable number, because it can be changed into a prime (28383133) 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, 106571 + ... + 106836.

It is an arithmetic number, because the mean of its divisors is an integer number (4268160).

Almost surely, 2^28383131 is an apocalyptic number.

28383131 is a deficient number, since it is larger than the sum of its proper divisors (5762149).

28383131 is a wasteful number, since it uses less digits than its factorization.

28383131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213433.

The product of its digits is 3456, while the sum is 29.

The square root of 28383131 is about 5327.5820969742. The cubic root of 28383131 is about 305.0376411485.

It can be divided in two parts, 28383 and 131, that multiplied together give a palindrome (3718173).

The spelling of 28383131 in words is "twenty-eight million, three hundred eighty-three thousand, one hundred thirty-one".