71730931 has 8 divisors (see below), whose sum is σ = 74703744. Its totient is φ = 68799360.

The previous prime is 71730913. The next prime is 71730979. The reversal of 71730931 is 13903717.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 71730931 - 2⁹ = 71730419 is a prime.

It is a super-2 number, since 2×71730931² = 10290652924253522, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 71730893 and 71730902.

It is not an unprimeable number, because it can be changed into a prime (71730991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6736 + ... + 13741.

It is an arithmetic number, because the mean of its divisors is an integer number (9337968).

Almost surely, 2^71730931 is an apocalyptic number.

71730931 is a deficient number, since it is larger than the sum of its proper divisors (2972813).

71730931 is a wasteful number, since it uses less digits than its factorization.

71730931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20621.

The product of its (nonzero) digits is 3969, while the sum is 31.

The square root of 71730931 is about 8469.4114907708. The cubic root of 71730931 is about 415.4978898692.

The spelling of 71730931 in words is "seventy-one million, seven hundred thirty thousand, nine hundred thirty-one".