71250057 has 16 divisors (see below), whose sum is σ = 111112000. Its totient is φ = 44999712.

The previous prime is 71250041. The next prime is 71250083. The reversal of 71250057 is 75005217.

It is not a de Polignac number, because 71250057 - 2⁴ = 71250041 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 71250057.

It is not an unprimeable number, because it can be changed into a prime (71250007) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 68932 + ... + 69957.

It is an arithmetic number, because the mean of its divisors is an integer number (6944500).

Almost surely, 2^71250057 is an apocalyptic number.

It is an amenable number.

71250057 is a deficient number, since it is larger than the sum of its proper divisors (39861943).

71250057 is a wasteful number, since it uses less digits than its factorization.

71250057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138917 (or 138911 counting only the distinct ones).

The product of its (nonzero) digits is 2450, while the sum is 27.

The square root of 71250057 is about 8440.9748844550. The cubic root of 71250057 is about 414.5673276437.

The spelling of 71250057 in words is "seventy-one million, two hundred fifty thousand, fifty-seven".