71992644 has 12 divisors (see below), whose sum is σ = 167982864. Its totient is φ = 23997544.

The previous prime is 71992643. The next prime is 71992649. The reversal of 71992644 is 44629917.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×71992644² = 10365881580221472, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 71992596 and 71992605.

It is not an unprimeable number, because it can be changed into a prime (71992643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2999682 + ... + 2999705.

It is an arithmetic number, because the mean of its divisors is an integer number (13998572).

Almost surely, 2^71992644 is an apocalyptic number.

It is an amenable number.

71992644 is an abundant number, since it is smaller than the sum of its proper divisors (95990220).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

71992644 is a wasteful number, since it uses less digits than its factorization.

71992644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5999394 (or 5999392 counting only the distinct ones).

The product of its digits is 108864, while the sum is 42.

The square root of 71992644 is about 8484.8479067099. The cubic root of 71992644 is about 416.0025964458.

The spelling of 71992644 in words is "seventy-one million, nine hundred ninety-two thousand, six hundred forty-four".