81340076 has 12 divisors (see below), whose sum is σ = 143288880. Its totient is φ = 40400400.

The previous prime is 81340073. The next prime is 81340079. The reversal of 81340076 is 67004318.

It is an interprime number because it is at equal distance from previous prime (81340073) and next prime (81340079).

It is not an unprimeable number, because it can be changed into a prime (81340073) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66731 + ... + 67938.

It is an arithmetic number, because the mean of its divisors is an integer number (11940740).

Almost surely, 2^81340076 is an apocalyptic number.

It is an amenable number.

81340076 is a deficient number, since it is larger than the sum of its proper divisors (61948804).

81340076 is a wasteful number, since it uses less digits than its factorization.

81340076 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134824 (or 134822 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 81340076 is about 9018.8733220952. The cubic root of 81340076 is about 433.2795496694.

The spelling of 81340076 in words is "eighty-one million, three hundred forty thousand, seventy-six".