729021736 has 32 divisors (see below), whose sum is σ = 1403738280. Its totient is φ = 354816000.

The previous prime is 729021721. The next prime is 729021751. The reversal of 729021736 is 637120927.

It is an interprime number because it is at equal distance from previous prime (729021721) and next prime (729021751).

It can be written as a sum of positive squares in 4 ways, for example, as 634737636 + 94284100 = 25194^2 + 9710^2 .

It is a junction number, because it is equal to n+sod(n) for n = 729021695 and 729021704.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39636 + ... + 55036.

Almost surely, 2^729021736 is an apocalyptic number.

It is an amenable number.

729021736 is a deficient number, since it is larger than the sum of its proper divisors (674716544).

729021736 is a wasteful number, since it uses less digits than its factorization.

729021736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15565 (or 15561 counting only the distinct ones).

The product of its (nonzero) digits is 31752, while the sum is 37.

The square root of 729021736 is about 27000.4025155182. The cubic root of 729021736 is about 900.0089447671.

The spelling of 729021736 in words is "seven hundred twenty-nine million, twenty-one thousand, seven hundred thirty-six".