81674755 has 4 divisors (see below), whose sum is σ = 98009712. Its totient is φ = 65339800.

The previous prime is 81674753. The next prime is 81674773. The reversal of 81674755 is 55747618.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 81674755 - 2¹ = 81674753 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81674753) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8167471 + ... + 8167480.

It is an arithmetic number, because the mean of its divisors is an integer number (24502428).

Almost surely, 2^81674755 is an apocalyptic number.

81674755 is a deficient number, since it is larger than the sum of its proper divisors (16334957).

81674755 is a wasteful number, since it uses less digits than its factorization.

81674755 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16334956.

The product of its digits is 235200, while the sum is 43.

The square root of 81674755 is about 9037.4086440749. The cubic root of 81674755 is about 433.8729887347.

The spelling of 81674755 in words is "eighty-one million, six hundred seventy-four thousand, seven hundred fifty-five".