728767523 has 4 divisors (see below), whose sum is σ = 795019128. Its totient is φ = 662515920.

The previous prime is 728767519. The next prime is 728767531. The reversal of 728767523 is 325767827.

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

It is not a de Polignac number, because 728767523 - 2² = 728767519 is a prime.

It is a super-2 number, since 2×728767523² = 1062204205159111058, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (728767513) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33125786 + ... + 33125807.

It is an arithmetic number, because the mean of its divisors is an integer number (198754782).

Almost surely, 2^728767523 is an apocalyptic number.

728767523 is a deficient number, since it is larger than the sum of its proper divisors (66251605).

728767523 is a wasteful number, since it uses less digits than its factorization.

728767523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66251604.

The product of its digits is 987840, while the sum is 47.

The square root of 728767523 is about 26995.6945270908. The cubic root of 728767523 is about 899.9043202812.

The spelling of 728767523 in words is "seven hundred twenty-eight million, seven hundred sixty-seven thousand, five hundred twenty-three".