71643946 has 32 divisors (see below), whose sum is σ = 124701120. Its totient is φ = 30528000.

The previous prime is 71643931. The next prime is 71643947. The reversal of 71643946 is 64934617.

It is a junction number, because it is equal to n+sod(n) for n = 71643899 and 71643908.

It is not an unprimeable number, because it can be changed into a prime (71643947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41370 + ... + 43066.

It is an arithmetic number, because the mean of its divisors is an integer number (3896910).

Almost surely, 2^71643946 is an apocalyptic number.

71643946 is a deficient number, since it is larger than the sum of its proper divisors (53057174).

71643946 is a wasteful number, since it uses less digits than its factorization.

71643946 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1830.

The product of its digits is 108864, while the sum is 40.

The square root of 71643946 is about 8464.2746883593. The cubic root of 71643946 is about 415.3298698225.

The spelling of 71643946 in words is "seventy-one million, six hundred forty-three thousand, nine hundred forty-six".