728474614731 has 24 divisors (see below), whose sum is σ = 1053752937120. Its totient is φ = 484952227200.

The previous prime is 728474614727. The next prime is 728474614733. The reversal of 728474614731 is 137416474827.

It is a happy number.

728474614731 is a `hidden beast` number, since 7 + 28 + 474 + 6 + 147 + 3 + 1 = 666.

It is not a de Polignac number, because 728474614731 - 2² = 728474614727 is a prime.

It is a super-2 number, since 2×728474614731² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (728474614733) 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 23 ways as a sum of consecutive naturals, for example, 68006466 + ... + 68017176.

It is an arithmetic number, because the mean of its divisors is an integer number (43906372380).

Almost surely, 2^728474614731 is an apocalyptic number.

728474614731 is a deficient number, since it is larger than the sum of its proper divisors (325278322389).

728474614731 is a wasteful number, since it uses less digits than its factorization.

728474614731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20867 (or 20864 counting only the distinct ones).

The product of its digits is 6322176, while the sum is 54.

The spelling of 728474614731 in words is "seven hundred twenty-eight billion, four hundred seventy-four million, six hundred fourteen thousand, seven hundred thirty-one".