730721871 has 32 divisors (see below), whose sum is σ = 1182570240. Its totient is φ = 442260000.

The previous prime is 730721837. The next prime is 730721909. The reversal of 730721871 is 178127037.

It is a happy number.

It is not a de Polignac number, because 730721871 - 2⁷ = 730721743 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (730725871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 323496 + ... + 325746.

It is an arithmetic number, because the mean of its divisors is an integer number (36955320).

Almost surely, 2^730721871 is an apocalyptic number.

730721871 is a deficient number, since it is larger than the sum of its proper divisors (451848369).

730721871 is a wasteful number, since it uses less digits than its factorization.

730721871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3364 (or 3358 counting only the distinct ones).

The product of its (nonzero) digits is 16464, while the sum is 36.

The square root of 730721871 is about 27031.8676935205. The cubic root of 730721871 is about 900.7080317329.

The spelling of 730721871 in words is "seven hundred thirty million, seven hundred twenty-one thousand, eight hundred seventy-one".