81670014 has 48 divisors (see below), whose sum is σ = 180442080. Its totient is φ = 26692800.

The previous prime is 81670007. The next prime is 81670019. The reversal of 81670014 is 41007618.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 81670014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81670019) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 303472 + ... + 303740.

It is an arithmetic number, because the mean of its divisors is an integer number (3759210).

Almost surely, 2^81670014 is an apocalyptic number.

81670014 is an abundant number, since it is smaller than the sum of its proper divisors (98772066).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81670014 is a wasteful number, since it uses less digits than its factorization.

81670014 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 545 (or 542 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 27.

The square root of 81670014 is about 9037.1463416280. The cubic root of 81670014 is about 433.8645935187.

The spelling of 81670014 in words is "eighty-one million, six hundred seventy thousand, fourteen".