81694077 has 8 divisors (see below), whose sum is σ = 109473600. Its totient is φ = 54188640.

The previous prime is 81694057. The next prime is 81694097. The reversal of 81694077 is 77049618.

It is an interprime number because it is at equal distance from previous prime (81694057) and next prime (81694097).

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

It is not a de Polignac number, because 81694077 - 2⁶ = 81694013 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81694057) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67824 + ... + 69017.

It is an arithmetic number, because the mean of its divisors is an integer number (13684200).

Almost surely, 2^81694077 is an apocalyptic number.

It is an amenable number.

81694077 is a deficient number, since it is larger than the sum of its proper divisors (27779523).

81694077 is a wasteful number, since it uses less digits than its factorization.

81694077 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137043.

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

The square root of 81694077 is about 9038.4775819825. The cubic root of 81694077 is about 433.9072001745.

It can be divided in two parts, 8169 and 4077, that added together give a triangular number (12246 = T₁₅₆).

The spelling of 81694077 in words is "eighty-one million, six hundred ninety-four thousand, seventy-seven".