71939944 has 8 divisors (see below), whose sum is σ = 134887410. Its totient is φ = 35969968.

The previous prime is 71939941. The next prime is 71939963. The reversal of 71939944 is 44993917.

It can be written as a sum of positive squares in only one way, i.e., 37576900 + 34363044 = 6130^2 + 5862^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a hoax number, since the sum of its digits (46) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 71939894 and 71939903.

It is not an unprimeable number, because it can be changed into a prime (71939941) 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 as a sum of consecutive naturals, namely, 4496239 + ... + 4496254.

Almost surely, 2^71939944 is an apocalyptic number.

It is an amenable number.

71939944 is a deficient number, since it is larger than the sum of its proper divisors (62947466).

71939944 is a wasteful number, since it uses less digits than its factorization.

71939944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8992499 (or 8992495 counting only the distinct ones).

The product of its digits is 244944, while the sum is 46.

The square root of 71939944 is about 8481.7418022479. The cubic root of 71939944 is about 415.9010643669.

The spelling of 71939944 in words is "seventy-one million, nine hundred thirty-nine thousand, nine hundred forty-four".