81793702 has 4 divisors (see below), whose sum is σ = 122690556. Its totient is φ = 40896850.

The previous prime is 81793693. The next prime is 81793721. The reversal of 81793702 is 20739718.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 20739718 = 2 ⋅10369859.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20448424 + ... + 20448427.

It is an arithmetic number, because the mean of its divisors is an integer number (30672639).

Almost surely, 2^81793702 is an apocalyptic number.

81793702 is a deficient number, since it is larger than the sum of its proper divisors (40896854).

81793702 is a wasteful number, since it uses less digits than its factorization.

81793702 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40896853.

The product of its (nonzero) digits is 21168, while the sum is 37.

The square root of 81793702 is about 9043.9870632371. The cubic root of 81793702 is about 434.0835101604.

It can be divided in two parts, 8179 and 3702, that added together give a square (11881 = 109²).

The spelling of 81793702 in words is "eighty-one million, seven hundred ninety-three thousand, seven hundred two".