28402523 has 4 divisors (see below), whose sum is σ = 29006880. Its totient is φ = 27798168.

The previous prime is 28402519. The next prime is 28402531. The reversal of 28402523 is 32520482.

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

It is a cyclic number.

It is not a de Polignac number, because 28402523 - 2² = 28402519 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28402492 and 28402501.

It is not an unprimeable number, because it can be changed into a prime (28402123) 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, 302108 + ... + 302201.

It is an arithmetic number, because the mean of its divisors is an integer number (7251720).

Almost surely, 2^28402523 is an apocalyptic number.

28402523 is a deficient number, since it is larger than the sum of its proper divisors (604357).

28402523 is an equidigital number, since it uses as much as digits as its factorization.

28402523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 604356.

The product of its (nonzero) digits is 3840, while the sum is 26.

The square root of 28402523 is about 5329.4017487894. The cubic root of 28402523 is about 305.1070948826.

The spelling of 28402523 in words is "twenty-eight million, four hundred two thousand, five hundred twenty-three".