71801142 has 64 divisors (see below), whose sum is σ = 170311680. Its totient is φ = 19754784.

The previous prime is 71801113. The next prime is 71801143. The reversal of 71801142 is 24110817.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71801143) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 149659 + ... + 150137.

It is an arithmetic number, because the mean of its divisors is an integer number (2661120).

Almost surely, 2^71801142 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 71801142, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (85155840).

71801142 is an abundant number, since it is smaller than the sum of its proper divisors (98510538).

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

71801142 is a wasteful number, since it uses less digits than its factorization.

71801142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 617.

The product of its (nonzero) digits is 448, while the sum is 24.

The square root of 71801142 is about 8473.5554521110. Note that the first 3 decimals coincide. The cubic root of 71801142 is about 415.6334102506.

Adding to 71801142 its reverse (24110817), we get a palindrome (95911959).

The spelling of 71801142 in words is "seventy-one million, eight hundred one thousand, one hundred forty-two".