28331423 has 8 divisors (see below), whose sum is σ = 29684448. Its totient is φ = 26988544.

The previous prime is 28331417. The next prime is 28331437. The reversal of 28331423 is 32413382.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28331423 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28331392 and 28331401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28333423) 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, 3515 + ... + 8307.

It is an arithmetic number, because the mean of its divisors is an integer number (3710556).

Almost surely, 2^28331423 is an apocalyptic number.

28331423 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

28331423 is a deficient number, since it is larger than the sum of its proper divisors (1353025).

28331423 is a wasteful number, since it uses less digits than its factorization.

28331423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5073.

The product of its digits is 3456, while the sum is 26.

The square root of 28331423 is about 5322.7270266284. The cubic root of 28331423 is about 304.8522907453.

The spelling of 28331423 in words is "twenty-eight million, three hundred thirty-one thousand, four hundred twenty-three".