71023140 has 108 divisors (see below), whose sum is σ = 227580444. Its totient is φ = 17926272.

The previous prime is 71023123. The next prime is 71023153. The reversal of 71023140 is 4132017.

It can be written as a sum of positive squares in 2 ways, for example, as 53231616 + 17791524 = 7296^2 + 4218^2 .

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 pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 64434 + ... + 65526.

Almost surely, 2^71023140 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 71023140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (113790222).

71023140 is an abundant number, since it is smaller than the sum of its proper divisors (156557304).

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

71023140 is a wasteful number, since it uses less digits than its factorization.

71023140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1146 (or 1122 counting only the distinct ones).

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

The square root of 71023140 is about 8427.5227676940. The cubic root of 71023140 is about 414.1267552780.

Adding to 71023140 its reverse (4132017), we get a palindrome (75155157).

The spelling of 71023140 in words is "seventy-one million, twenty-three thousand, one hundred forty".