81029999932 has 36 divisors (see below), whose sum is σ = 165965981160. Its totient is φ = 34514079264.

The previous prime is 81029999923. The next prime is 81029999959. The reversal of 81029999932 is 23999992018.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1236207 + ... + 1300102.

Almost surely, 2^81029999932 is an apocalyptic number.

It is an amenable number.

81029999932 is an abundant number, since it is smaller than the sum of its proper divisors (84935981228).

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

81029999932 is a wasteful number, since it uses less digits than its factorization.

81029999932 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2536490 (or 2536481 counting only the distinct ones).

The product of its (nonzero) digits is 5668704, while the sum is 61.

The spelling of 81029999932 in words is "eighty-one billion, twenty-nine million, nine hundred ninety-nine thousand, nine hundred thirty-two".