81837742 has 16 divisors (see below), whose sum is σ = 143157600. Its totient is φ = 35073024.

The previous prime is 81837727. The next prime is 81837757. The reversal of 81837742 is 24773818.

It is an interprime number because it is at equal distance from previous prime (81837727) and next prime (81837757).

It is a junction number, because it is equal to n+sod(n) for n = 81837695 and 81837704.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58963 + ... + 60334.

It is an arithmetic number, because the mean of its divisors is an integer number (8947350).

Almost surely, 2^81837742 is an apocalyptic number.

81837742 is a deficient number, since it is larger than the sum of its proper divisors (61319858).

81837742 is a wasteful number, since it uses less digits than its factorization.

81837742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119320 (or 119306 counting only the distinct ones).

The product of its digits is 75264, while the sum is 40.

The square root of 81837742 is about 9046.4215024506. The cubic root of 81837742 is about 434.1614037199.

The spelling of 81837742 in words is "eighty-one million, eight hundred thirty-seven thousand, seven hundred forty-two".