71738591 has 8 divisors (see below), whose sum is σ = 73482240. Its totient is φ = 70004088.

The previous prime is 71738567. The next prime is 71738593. The reversal of 71738591 is 19583717.

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

It is a cyclic number.

It is not a de Polignac number, because 71738591 - 2²² = 67544287 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71738593) 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, 15170 + ... + 19328.

It is an arithmetic number, because the mean of its divisors is an integer number (9185280).

Almost surely, 2^71738591 is an apocalyptic number.

71738591 is a deficient number, since it is larger than the sum of its proper divisors (1743649).

71738591 is a wasteful number, since it uses less digits than its factorization.

71738591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4573.

The product of its digits is 52920, while the sum is 41.

The square root of 71738591 is about 8469.8636942987. The cubic root of 71738591 is about 415.5126794005.

The spelling of 71738591 in words is "seventy-one million, seven hundred thirty-eight thousand, five hundred ninety-one".