71818057 has 4 divisors (see below), whose sum is σ = 72801940. Its totient is φ = 70834176.

The previous prime is 71818051. The next prime is 71818093. The reversal of 71818057 is 75081817.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 75081817 = 6899 ⋅10883.

It can be written as a sum of positive squares in 2 ways, for example, as 54479161 + 17338896 = 7381^2 + 4164^2 .

It is a cyclic number.

It is not a de Polignac number, because 71818057 - 2³ = 71818049 is a prime.

It is a super-2 number, since 2×71818057² = 10315666622510498, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71818051) 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, 491832 + ... + 491977.

It is an arithmetic number, because the mean of its divisors is an integer number (18200485).

Almost surely, 2^71818057 is an apocalyptic number.

It is an amenable number.

71818057 is a deficient number, since it is larger than the sum of its proper divisors (983883).

71818057 is an equidigital number, since it uses as much as digits as its factorization.

71818057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 983882.

The product of its (nonzero) digits is 15680, while the sum is 37.

The square root of 71818057 is about 8474.5534985626. The cubic root of 71818057 is about 415.6660461620. Note that the first 3 decimals are identical.

The spelling of 71818057 in words is "seventy-one million, eight hundred eighteen thousand, fifty-seven".