28021032523 has 4 divisors (see below), whose sum is σ = 30568399128. Its totient is φ = 25473665920.

The previous prime is 28021032451. The next prime is 28021032539. The reversal of 28021032523 is 32523012082.

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-28021032523 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28021032491 and 28021032500.

It is not an unprimeable number, because it can be changed into a prime (28021032583) 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, 1273683286 + ... + 1273683307.

It is an arithmetic number, because the mean of its divisors is an integer number (7642099782).

Almost surely, 2^28021032523 is an apocalyptic number.

28021032523 is a deficient number, since it is larger than the sum of its proper divisors (2547366605).

28021032523 is a wasteful number, since it uses less digits than its factorization.

28021032523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2547366604.

The product of its (nonzero) digits is 5760, while the sum is 28.

The spelling of 28021032523 in words is "twenty-eight billion, twenty-one million, thirty-two thousand, five hundred twenty-three".