71561623 has 8 divisors (see below), whose sum is σ = 82258848. Its totient is φ = 60982944.

The previous prime is 71561621. The next prime is 71561627. The reversal of 71561623 is 32616517.

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 71561623 - 2¹ = 71561621 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71561621) 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, 28336 + ... + 30757.

It is an arithmetic number, because the mean of its divisors is an integer number (10282356).

Almost surely, 2^71561623 is an apocalyptic number.

71561623 is a deficient number, since it is larger than the sum of its proper divisors (10697225).

71561623 is a wasteful number, since it uses less digits than its factorization.

71561623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59273.

The product of its digits is 7560, while the sum is 31.

The square root of 71561623 is about 8459.4103222388. The cubic root of 71561623 is about 415.1707295786.

The spelling of 71561623 in words is "seventy-one million, five hundred sixty-one thousand, six hundred twenty-three".