7281028731 has 8 divisors (see below), whose sum is σ = 9708500304. Its totient is φ = 4853788160.

The previous prime is 7281028723. The next prime is 7281028739. The reversal of 7281028731 is 1378201827.

7281028731 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (7281028723) and next prime (7281028739).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 7281028731 - 2³ = 7281028723 is a prime.

It is a super-2 number, since 2×7281028731² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 7281028731.

It is not an unprimeable number, because it can be changed into a prime (7281028739) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38911 + ... + 126791.

It is an arithmetic number, because the mean of its divisors is an integer number (1213562538).

Almost surely, 2^7281028731 is an apocalyptic number.

7281028731 is a deficient number, since it is larger than the sum of its proper divisors (2427471573).

7281028731 is a wasteful number, since it uses less digits than its factorization.

7281028731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115501.

The product of its (nonzero) digits is 37632, while the sum is 39.

The square root of 7281028731 is about 85328.9442744957. The cubic root of 7281028731 is about 1938.1955030412.

The spelling of 7281028731 in words is "seven billion, two hundred eighty-one million, twenty-eight thousand, seven hundred thirty-one".