71564977 has 8 divisors (see below), whose sum is σ = 78465600. Its totient is φ = 64730160.

The previous prime is 71564971. The next prime is 71565023. The reversal of 71564977 is 77946517.

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

It is a de Polignac number, because none of the positive numbers 2^k-71564977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71564971) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14158 + ... + 18535.

It is an arithmetic number, because the mean of its divisors is an integer number (9808200).

Almost surely, 2^71564977 is an apocalyptic number.

It is an amenable number.

71564977 is a deficient number, since it is larger than the sum of its proper divisors (6900623).

71564977 is a wasteful number, since it uses less digits than its factorization.

71564977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32903.

The product of its digits is 370440, while the sum is 46.

The square root of 71564977 is about 8459.6085606841. The cubic root of 71564977 is about 415.1772156476.

The spelling of 71564977 in words is "seventy-one million, five hundred sixty-four thousand, nine hundred seventy-seven".