81793935 has 32 divisors (see below), whose sum is σ = 147598080. Its totient is φ = 42967584.

The previous prime is 81793931. The next prime is 81793963. The reversal of 81793935 is 53939718.

It is a happy number.

It is a Cunningham number, because it is equal to 9044²-1.

It is not a de Polignac number, because 81793935 - 2² = 81793931 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81793931) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4524 + ... + 13566.

It is an arithmetic number, because the mean of its divisors is an integer number (4612440).

Almost surely, 2^81793935 is an apocalyptic number.

81793935 is a deficient number, since it is larger than the sum of its proper divisors (65804145).

81793935 is a wasteful number, since it uses less digits than its factorization.

81793935 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9124 (or 9118 counting only the distinct ones).

The product of its digits is 204120, while the sum is 45.

The square root of 81793935 is about 9043.9999447147. Note that the first 4 decimals coincide. The cubic root of 81793935 is about 434.0839223412.

It can be divided in two parts, 81793 and 935, that added together give a palindrome (82728).

The spelling of 81793935 in words is "eighty-one million, seven hundred ninety-three thousand, nine hundred thirty-five".