28236423 has 8 divisors (see below), whose sum is σ = 38524288. Its totient is φ = 18386424.

The previous prime is 28236421. The next prime is 28236449. The reversal of 28236423 is 32463282.

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

It is not a de Polignac number, because 28236423 - 2¹ = 28236421 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28236421) 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, 109315 + ... + 109572.

It is an arithmetic number, because the mean of its divisors is an integer number (4815536).

Almost surely, 2^28236423 is an apocalyptic number.

28236423 is a deficient number, since it is larger than the sum of its proper divisors (10287865).

28236423 is a wasteful number, since it uses less digits than its factorization.

28236423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 218933.

The product of its digits is 13824, while the sum is 30.

The square root of 28236423 is about 5313.7955361493. The cubic root of 28236423 is about 304.5111689411.

It can be divided in two parts, 28236 and 423, that multiplied together give a triangular number (11943828 = T₄₈₈₇).

The spelling of 28236423 in words is "twenty-eight million, two hundred thirty-six thousand, four hundred twenty-three".