81674079 has 8 divisors (see below), whose sum is σ = 110390832. Its totient is φ = 53703360.

The previous prime is 81674077. The next prime is 81674093. The reversal of 81674079 is 97047618.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 81674079 - 2¹ = 81674077 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 81674079.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81674077) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 186252 + ... + 186689.

It is an arithmetic number, because the mean of its divisors is an integer number (13798854).

Almost surely, 2^81674079 is an apocalyptic number.

81674079 is a deficient number, since it is larger than the sum of its proper divisors (28716753).

81674079 is a wasteful number, since it uses less digits than its factorization.

81674079 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 373017.

The product of its (nonzero) digits is 84672, while the sum is 42.

The square root of 81674079 is about 9037.3712438961. The cubic root of 81674079 is about 433.8717917147.

It can be divided in two parts, 8167 and 4079, that added together give a triangular number (12246 = T₁₅₆).

The spelling of 81674079 in words is "eighty-one million, six hundred seventy-four thousand, seventy-nine".