81029932 has 6 divisors (see below), whose sum is σ = 141802388. Its totient is φ = 40514964.

The previous prime is 81029929. The next prime is 81029933. The reversal of 81029932 is 23992018.

It is not an unprimeable number, because it can be changed into a prime (81029933) 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 as a sum of consecutive naturals, namely, 10128738 + ... + 10128745.

Almost surely, 2^81029932 is an apocalyptic number.

It is an amenable number.

81029932 is a deficient number, since it is larger than the sum of its proper divisors (60772456).

81029932 is a wasteful number, since it uses less digits than its factorization.

81029932 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20257487 (or 20257485 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 81029932 is about 9001.6627352951. The cubic root of 81029932 is about 432.7281601018.

The spelling of 81029932 in words is "eighty-one million, twenty-nine thousand, nine hundred thirty-two".