71972691 has 8 divisors (see below), whose sum is σ = 109672704. Its totient is φ = 41127240.

The previous prime is 71972653. The next prime is 71972707. The reversal of 71972691 is 19627917.

It is a happy number.

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

It is not a de Polignac number, because 71972691 - 2¹⁰ = 71971667 is a prime.

It is not an unprimeable number, because it can be changed into a prime (71972291) 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, 1713615 + ... + 1713656.

It is an arithmetic number, because the mean of its divisors is an integer number (13709088).

Almost surely, 2^71972691 is an apocalyptic number.

71972691 is a deficient number, since it is larger than the sum of its proper divisors (37700013).

71972691 is a wasteful number, since it uses less digits than its factorization.

71972691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3427281.

The product of its digits is 47628, while the sum is 42.

The square root of 71972691 is about 8483.6720233635. The cubic root of 71972691 is about 415.9641607284.

The spelling of 71972691 in words is "seventy-one million, nine hundred seventy-two thousand, six hundred ninety-one".