28372523 has 4 divisors (see below), whose sum is σ = 28772208. Its totient is φ = 27972840.

The previous prime is 28372517. The next prime is 28372559. The reversal of 28372523 is 32527382.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28372523 is a prime.

It is a super-2 number, since 2×28372523² = 1610000122771058, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28372523.

It is not an unprimeable number, because it can be changed into a prime (28372723) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 199736 + ... + 199877.

It is an arithmetic number, because the mean of its divisors is an integer number (7193052).

Almost surely, 2^28372523 is an apocalyptic number.

28372523 is a deficient number, since it is larger than the sum of its proper divisors (399685).

28372523 is an equidigital number, since it uses as much as digits as its factorization.

28372523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 399684.

The product of its digits is 20160, while the sum is 32.

The square root of 28372523 is about 5326.5864303511. The cubic root of 28372523 is about 304.9996345064. Note that the first 3 decimals are identical.

The spelling of 28372523 in words is "twenty-eight million, three hundred seventy-two thousand, five hundred twenty-three".