71561634 has 8 divisors (see below), whose sum is σ = 143123280. Its totient is φ = 23853876.

The previous prime is 71561627. The next prime is 71561639. The reversal of 71561634 is 43616517.

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

71561634 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 71561595 and 71561604.

It is not an unprimeable number, because it can be changed into a prime (71561639) 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, 5963464 + ... + 5963475.

It is an arithmetic number, because the mean of its divisors is an integer number (17890410).

Almost surely, 2^71561634 is an apocalyptic number.

71561634 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

71561634 is a wasteful number, since it uses less digits than its factorization.

71561634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11926944.

The product of its digits is 15120, while the sum is 33.

The square root of 71561634 is about 8459.4109724023. The cubic root of 71561634 is about 415.1707508511.

The spelling of 71561634 in words is "seventy-one million, five hundred sixty-one thousand, six hundred thirty-four".