71389590 has 64 divisors (see below), whose sum is σ = 183029760. Its totient is φ = 17781120.

The previous prime is 71389583. The next prime is 71389601. The reversal of 71389590 is 9598317.

It is a happy number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 25647 + ... + 28293.

It is an arithmetic number, because the mean of its divisors is an integer number (2859840).

Almost surely, 2^71389590 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 71389590, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (91514880).

71389590 is an abundant number, since it is smaller than the sum of its proper divisors (111640170).

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

71389590 is a wasteful number, since it uses less digits than its factorization.

71389590 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2717.

The product of its (nonzero) digits is 68040, while the sum is 42.

The square root of 71389590 is about 8449.2360601418. The cubic root of 71389590 is about 414.8377746931.

The spelling of 71389590 in words is "seventy-one million, three hundred eighty-nine thousand, five hundred ninety".