28231669 has 8 divisors (see below), whose sum is σ = 29693952. Its totient is φ = 26803920.

The previous prime is 28231667. The next prime is 28231691. The reversal of 28231669 is 96613282.

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 28231669 - 2¹ = 28231667 is a prime.

It is a super-2 number, since 2×28231669² = 1594054269051122, 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 (28231667) 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, 6949 + ... + 10234.

It is an arithmetic number, because the mean of its divisors is an integer number (3711744).

Almost surely, 2^28231669 is an apocalyptic number.

It is an amenable number.

28231669 is a deficient number, since it is larger than the sum of its proper divisors (1462283).

28231669 is a wasteful number, since it uses less digits than its factorization.

28231669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17267.

The product of its digits is 31104, while the sum is 37.

The square root of 28231669 is about 5313.3481911126. The cubic root of 28231669 is about 304.4940783988.

It can be divided in two parts, 28231 and 669, that added together give a square (28900 = 170²).

The spelling of 28231669 in words is "twenty-eight million, two hundred thirty-one thousand, six hundred sixty-nine".