81702423 has 12 divisors (see below), whose sum is σ = 128743368. Its totient is φ = 49516560.

The previous prime is 81702419. The next prime is 81702427. The reversal of 81702423 is 32420718.

It is an interprime number because it is at equal distance from previous prime (81702419) and next prime (81702427).

It is not a de Polignac number, because 81702423 - 2² = 81702419 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81702427) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 412540 + ... + 412737.

It is an arithmetic number, because the mean of its divisors is an integer number (10728614).

Almost surely, 2^81702423 is an apocalyptic number.

81702423 is a deficient number, since it is larger than the sum of its proper divisors (47040945).

81702423 is a wasteful number, since it uses less digits than its factorization.

81702423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 825294 (or 825291 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 81702423 is about 9038.9392629888. The cubic root of 81702423 is about 433.9219758935.

The spelling of 81702423 in words is "eighty-one million, seven hundred two thousand, four hundred twenty-three".