71643042 has 40 divisors (see below), whose sum is σ = 162369900. Its totient is φ = 23607936.

The previous prime is 71643029. The next prime is 71643059. The reversal of 71643042 is 24034617.

It can be written as a sum of positive squares in 2 ways, for example, as 64304361 + 7338681 = 8019^2 + 2709^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 71642997 and 71643015.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 11934 + ... + 16902.

Almost surely, 2^71643042 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 71643042, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (81184950).

71643042 is an abundant number, since it is smaller than the sum of its proper divisors (90726858).

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

71643042 is a wasteful number, since it uses less digits than its factorization.

71643042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5072 (or 5063 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 27.

The square root of 71643042 is about 8464.2212872774. The cubic root of 71643042 is about 415.3281229441.

Adding to 71643042 its reverse (24034617), we get a palindrome (95677659).

The spelling of 71643042 in words is "seventy-one million, six hundred forty-three thousand, forty-two".