1730728737 has 24 divisors (see below), whose sum is σ = 2522677248. Its totient is φ = 1143374400.

The previous prime is 1730728733. The next prime is 1730728739. The reversal of 1730728737 is 7378270371.

It is not a de Polignac number, because 1730728737 - 2² = 1730728733 is a prime.

It is a super-2 number, since 2×1730728737² = 5990843922155230338, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1730728692 and 1730728701.

It is not an unprimeable number, because it can be changed into a prime (1730728733) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 481248 + ... + 484830.

It is an arithmetic number, because the mean of its divisors is an integer number (105111552).

Almost surely, 2^1730728737 is an apocalyptic number.

It is an amenable number.

1730728737 is a deficient number, since it is larger than the sum of its proper divisors (791948511).

1730728737 is a wasteful number, since it uses less digits than its factorization.

1730728737 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4061 (or 4058 counting only the distinct ones).

The product of its (nonzero) digits is 345744, while the sum is 45.

The square root of 1730728737 is about 41602.0280395079. The cubic root of 1730728737 is about 1200.6313198878.

The spelling of 1730728737 in words is "one billion, seven hundred thirty million, seven hundred twenty-eight thousand, seven hundred thirty-seven".