71900057 has 4 divisors (see below), whose sum is σ = 71919120. Its totient is φ = 71880996.

The previous prime is 71900053. The next prime is 71900063. The reversal of 71900057 is 75000917.

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 71900057 - 2² = 71900053 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71900051) 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, 1763 + ... + 12120.

It is an arithmetic number, because the mean of its divisors is an integer number (17979780).

Almost surely, 2^71900057 is an apocalyptic number.

It is an amenable number.

71900057 is a deficient number, since it is larger than the sum of its proper divisors (19063).

71900057 is a wasteful number, since it uses less digits than its factorization.

71900057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19062.

The product of its (nonzero) digits is 2205, while the sum is 29.

The square root of 71900057 is about 8479.3901313715. The cubic root of 71900057 is about 415.8241849046.

The spelling of 71900057 in words is "seventy-one million, nine hundred thousand, fifty-seven".