81629620932 has 24 divisors (see below), whose sum is σ = 190474542496. Its totient is φ = 27209098368.

The previous prime is 81629620921. The next prime is 81629620973. The reversal of 81629620932 is 23902692618.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 478428 + ... + 626220.

Almost surely, 2^81629620932 is an apocalyptic number.

It is an amenable number.

81629620932 is an abundant number, since it is smaller than the sum of its proper divisors (108844921564).

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

81629620932 is a wasteful number, since it uses less digits than its factorization.

81629620932 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 193827 (or 193825 counting only the distinct ones).

The product of its (nonzero) digits is 559872, while the sum is 48.

The spelling of 81629620932 in words is "eighty-one billion, six hundred twenty-nine million, six hundred twenty thousand, nine hundred thirty-two".