71142040 has 16 divisors (see below), whose sum is σ = 160069680. Its totient is φ = 28456800.

The previous prime is 71142037. The next prime is 71142073. The reversal of 71142040 is 4024117.

It is a super-2 number, since 2×71142040² = 10122379710723200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 71141999 and 71142017.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 889236 + ... + 889315.

It is an arithmetic number, because the mean of its divisors is an integer number (10004355).

Almost surely, 2^71142040 is an apocalyptic number.

It is an amenable number.

71142040 is an abundant number, since it is smaller than the sum of its proper divisors (88927640).

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

71142040 is a wasteful number, since it uses less digits than its factorization.

71142040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1778562 (or 1778558 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 19.

The square root of 71142040 is about 8434.5740852754. The cubic root of 71142040 is about 414.3577232851.

Adding to 71142040 its reverse (4024117), we get a palindrome (75166157).

The spelling of 71142040 in words is "seventy-one million, one hundred forty-two thousand, forty".