81372286776 has 64 divisors (see below), whose sum is σ = 231573323520. Its totient is φ = 23586168320.

The previous prime is 81372286763. The next prime is 81372286783. The reversal of 81372286776 is 67768227318.

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 15 ways as a sum of consecutive naturals, for example, 6694545 + ... + 6706688.

It is an arithmetic number, because the mean of its divisors is an integer number (3618333180).

Almost surely, 2^81372286776 is an apocalyptic number.

It is an amenable number.

81372286776 is an abundant number, since it is smaller than the sum of its proper divisors (150201036744).

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

81372286776 is a wasteful number, since it uses less digits than its factorization.

81372286776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13401276 (or 13401272 counting only the distinct ones).

The product of its digits is 9483264, while the sum is 57.

The spelling of 81372286776 in words is "eighty-one billion, three hundred seventy-two million, two hundred eighty-six thousand, seven hundred seventy-six".