71980142 has 24 divisors (see below), whose sum is σ = 123801696. Its totient is φ = 31264896.

The previous prime is 71980127. The next prime is 71980147. The reversal of 71980142 is 24108917.

It is a super-2 number, since 2×71980142² = 10362281684680328, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 71980099 and 71980108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71980147) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 518 + ... + 12009.

It is an arithmetic number, because the mean of its divisors is an integer number (5158404).

Almost surely, 2^71980142 is an apocalyptic number.

71980142 is a deficient number, since it is larger than the sum of its proper divisors (51821554).

71980142 is a wasteful number, since it uses less digits than its factorization.

With its successor (71980143) it forms an eRAP, since the sums of their prime factors are consecutive (12572 and 12573).

71980142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12572 (or 12559 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 32.

The square root of 71980142 is about 8484.1111496727. Note that the first 4 decimals coincide. The cubic root of 71980142 is about 415.9785145153.

The spelling of 71980142 in words is "seventy-one million, nine hundred eighty thousand, one hundred forty-two".