81883747 has 8 divisors (see below), whose sum is σ = 94582512. Its totient is φ = 70060800.

The previous prime is 81883727. The next prime is 81883757. The reversal of 81883747 is 74738818.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 81883747 - 2¹¹ = 81881699 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81883697 and 81883706.

It is not an unprimeable number, because it can be changed into a prime (81883717) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 218754 + ... + 219127.

It is an arithmetic number, because the mean of its divisors is an integer number (11822814).

Almost surely, 2^81883747 is an apocalyptic number.

81883747 is a deficient number, since it is larger than the sum of its proper divisors (12698765).

81883747 is a wasteful number, since it uses less digits than its factorization.

81883747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 437909.

The product of its digits is 301056, while the sum is 46.

The square root of 81883747 is about 9048.9638633382. The cubic root of 81883747 is about 434.2427429380.

Subtracting from 81883747 its reverse (74738818), we obtain a square (7144929 = 2673²).

It can be divided in two parts, 8188 and 3747, that added together give a triangular number (11935 = T₁₅₄).

The spelling of 81883747 in words is "eighty-one million, eight hundred eighty-three thousand, seven hundred forty-seven".