81833788 has 24 divisors (see below), whose sum is σ = 147949200. Its totient is φ = 39575808.

The previous prime is 81833771. The next prime is 81833789. The reversal of 81833788 is 88733818.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81833789) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24948 + ... + 28036.

It is an arithmetic number, because the mean of its divisors is an integer number (6164550).

Almost surely, 2^81833788 is an apocalyptic number.

It is an amenable number.

81833788 is a deficient number, since it is larger than the sum of its proper divisors (66115412).

81833788 is a wasteful number, since it uses less digits than its factorization.

81833788 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3309 (or 3307 counting only the distinct ones).

The product of its digits is 258048, while the sum is 46.

The square root of 81833788 is about 9046.2029603586. The cubic root of 81833788 is about 434.1544114211.

It can be divided in two parts, 81833 and 788, that added together give a triangular number (82621 = T₄₀₆).

The spelling of 81833788 in words is "eighty-one million, eight hundred thirty-three thousand, seven hundred eighty-eight".