71000064 has 140 divisors (see below), whose sum is σ = 214093044. Its totient is φ = 23445504.

The previous prime is 71000051. The next prime is 71000081. The reversal of 71000064 is 46000017.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 663499 + ... + 663605.

Almost surely, 2^71000064 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 71000064, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (107046522).

71000064 is an abundant number, since it is smaller than the sum of its proper divisors (143092980).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

71000064 is an equidigital number, since it uses as much as digits as its factorization.

71000064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145 (or 112 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 18.

The square root of 71000064 is about 8426.1535708768. The cubic root of 71000064 is about 414.0818993612.

The spelling of 71000064 in words is "seventy-one million, sixty-four", and thus it is an aban number.