81877732 has 6 divisors (see below), whose sum is σ = 143286038. Its totient is φ = 40938864.

The previous prime is 81877717. The next prime is 81877777. The reversal of 81877732 is 23777818.

It can be written as a sum of positive squares in only one way, i.e., 69655716 + 12222016 = 8346^2 + 3496^2 .

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 10234713 + ... + 10234720.

Almost surely, 2^81877732 is an apocalyptic number.

It is an amenable number.

81877732 is a deficient number, since it is larger than the sum of its proper divisors (61408306).

81877732 is a wasteful number, since it uses less digits than its factorization.

81877732 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20469437 (or 20469435 counting only the distinct ones).

The product of its digits is 131712, while the sum is 43.

The square root of 81877732 is about 9048.6314987406. The cubic root of 81877732 is about 434.2321098386.

The spelling of 81877732 in words is "eighty-one million, eight hundred seventy-seven thousand, seven hundred thirty-two".