28701523 has 4 divisors (see below), whose sum is σ = 28712880. Its totient is φ = 28690168.

The previous prime is 28701509. The next prime is 28701551. The reversal of 28701523 is 32510782.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 32510782 = 2 ⋅16255391.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28701523 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28701491 and 28701500.

It is not an unprimeable number, because it can be changed into a prime (28701623) 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, 18 + ... + 7576.

It is an arithmetic number, because the mean of its divisors is an integer number (7178220).

Almost surely, 2^28701523 is an apocalyptic number.

28701523 is a deficient number, since it is larger than the sum of its proper divisors (11357).

28701523 is an equidigital number, since it uses as much as digits as its factorization.

28701523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11356.

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 28701523 is about 5357.3802366455. The cubic root of 28701523 is about 306.1740043003.

The spelling of 28701523 in words is "twenty-eight million, seven hundred one thousand, five hundred twenty-three".