81983736 has 48 divisors (see below), whose sum is σ = 222822600. Its totient is φ = 27231552.

The previous prime is 81983711. The next prime is 81983761. The reversal of 81983736 is 63738918.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (81983711) and next prime (81983761).

It is a junction number, because it is equal to n+sod(n) for n = 81983691 and 81983700.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20250 + ... + 23958.

Almost surely, 2^81983736 is an apocalyptic number.

It is an amenable number.

81983736 is an abundant number, since it is smaller than the sum of its proper divisors (140838864).

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

81983736 is a wasteful number, since it uses less digits than its factorization.

81983736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4028 (or 4021 counting only the distinct ones).

The product of its digits is 217728, while the sum is 45.

The square root of 81983736 is about 9054.4870644339. The cubic root of 81983736 is about 434.4194236505.

The spelling of 81983736 in words is "eighty-one million, nine hundred eighty-three thousand, seven hundred thirty-six".