81776042 has 8 divisors (see below), whose sum is σ = 122944800. Its totient is φ = 40794444.

The previous prime is 81776029. The next prime is 81776053. The reversal of 81776042 is 24067718.

It is a happy number.

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

It is a junction number, because it is equal to n+sod(n) for n = 81775993 and 81776011.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 45692 + ... + 47447.

It is an arithmetic number, because the mean of its divisors is an integer number (15368100).

Almost surely, 2^81776042 is an apocalyptic number.

81776042 is a deficient number, since it is larger than the sum of its proper divisors (41168758).

81776042 is a wasteful number, since it uses less digits than its factorization.

81776042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93580.

The product of its (nonzero) digits is 18816, while the sum is 35.

The square root of 81776042 is about 9043.0106712311. The cubic root of 81776042 is about 434.0522670599.

The spelling of 81776042 in words is "eighty-one million, seven hundred seventy-six thousand, forty-two".