71757842 has 8 divisors (see below), whose sum is σ = 115916556. Its totient is φ = 33118992.

The previous prime is 71757817. The next prime is 71757853. The reversal of 71757842 is 24875717.

It is a Cunningham number, because it is equal to 8471²+1.

It can be written as a sum of positive squares in 2 ways, for example, as 71757841 + 1 = 8471^2 + 1^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 71757842.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1379933 + ... + 1379984.

Almost surely, 2^71757842 is an apocalyptic number.

71757842 is a deficient number, since it is larger than the sum of its proper divisors (44158714).

71757842 is a wasteful number, since it uses less digits than its factorization.

71757842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2759932.

The product of its digits is 109760, while the sum is 41.

The square root of 71757842 is about 8471.0000590249. Note that the first 4 decimals coincide. The cubic root of 71757842 is about 415.5498435873.

The spelling of 71757842 in words is "seventy-one million, seven hundred fifty-seven thousand, eight hundred forty-two".