71800057 has 4 divisors (see below), whose sum is σ = 82057216. Its totient is φ = 61542900.

The previous prime is 71800021. The next prime is 71800073. The reversal of 71800057 is 75000817.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 71800057 - 2⁷ = 71799929 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 71799998 and 71800034.

It is not an unprimeable number, because it can be changed into a prime (71800007) 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, 5128569 + ... + 5128582.

It is an arithmetic number, because the mean of its divisors is an integer number (20514304).

Almost surely, 2^71800057 is an apocalyptic number.

It is an amenable number.

71800057 is a deficient number, since it is larger than the sum of its proper divisors (10257159).

71800057 is a wasteful number, since it uses less digits than its factorization.

71800057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10257158.

The product of its (nonzero) digits is 1960, while the sum is 28.

The square root of 71800057 is about 8473.4914291572. The cubic root of 71800057 is about 415.6313166696.

The spelling of 71800057 in words is "seventy-one million, eight hundred thousand, fifty-seven".