81876740 has 24 divisors (see below), whose sum is σ = 187572672. Its totient is φ = 29773280.

The previous prime is 81876737. The next prime is 81876763. The reversal of 81876740 is 4767818.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 185864 + ... + 186303.

It is an arithmetic number, because the mean of its divisors is an integer number (7815528).

Almost surely, 2^81876740 is an apocalyptic number.

It is an amenable number.

81876740 is an abundant number, since it is smaller than the sum of its proper divisors (105695932).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81876740 is a wasteful number, since it uses less digits than its factorization.

81876740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 372187 (or 372185 counting only the distinct ones).

The product of its (nonzero) digits is 75264, while the sum is 41.

The square root of 81876740 is about 9048.5766836558. The cubic root of 81876740 is about 434.2303561669.

The spelling of 81876740 in words is "eighty-one million, eight hundred seventy-six thousand, seven hundred forty".