81438676932 has 24 divisors (see below), whose sum is σ = 190746110016. Its totient is φ = 27043007008.

The previous prime is 81438676927. The next prime is 81438676937. The reversal of 81438676932 is 23967683418.

It is an interprime number because it is at equal distance from previous prime (81438676927) and next prime (81438676937).

It is not an unprimeable number, because it can be changed into a prime (81438676937) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12899043 + ... + 12905354.

It is an arithmetic number, because the mean of its divisors is an integer number (7947754584).

Almost surely, 2^81438676932 is an apocalyptic number.

It is an amenable number.

81438676932 is an abundant number, since it is smaller than the sum of its proper divisors (109307433084).

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

81438676932 is a wasteful number, since it uses less digits than its factorization.

81438676932 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25804667 (or 25804665 counting only the distinct ones).

The product of its digits is 10450944, while the sum is 57.

The spelling of 81438676932 in words is "eighty-one billion, four hundred thirty-eight million, six hundred seventy-six thousand, nine hundred thirty-two".