731663891 has 32 divisors (see below), whose sum is σ = 880803840. Its totient is φ = 594669600.

The previous prime is 731663873. The next prime is 731663929. The reversal of 731663891 is 198366137.

731663891 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 731663891 - 2¹⁴ = 731647507 is a prime.

It is not an unprimeable number, because it can be changed into a prime (731663831) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3830606 + ... + 3830796.

It is an arithmetic number, because the mean of its divisors is an integer number (27525120).

Almost surely, 2^731663891 is an apocalyptic number.

731663891 is a deficient number, since it is larger than the sum of its proper divisors (149139949).

731663891 is a wasteful number, since it uses less digits than its factorization.

731663891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 495.

The product of its digits is 163296, while the sum is 44.

The square root of 731663891 is about 27049.2863306964. The cubic root of 731663891 is about 901.0949188476.

The spelling of 731663891 in words is "seven hundred thirty-one million, six hundred sixty-three thousand, eight hundred ninety-one".