81377676 has 24 divisors (see below), whose sum is σ = 210979440. Its totient is φ = 27125856.

The previous prime is 81377641. The next prime is 81377677. The reversal of 81377676 is 67677318.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (81377677) 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, 376641 + ... + 376856.

It is an arithmetic number, because the mean of its divisors is an integer number (8790810).

Almost surely, 2^81377676 is an apocalyptic number.

It is an amenable number.

81377676 is an abundant number, since it is smaller than the sum of its proper divisors (129601764).

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

81377676 is a wasteful number, since it uses less digits than its factorization.

81377676 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 753510 (or 753502 counting only the distinct ones).

The product of its digits is 296352, while the sum is 45.

The square root of 81377676 is about 9020.9575988362. The cubic root of 81377676 is about 433.3463015185.

The spelling of 81377676 in words is "eighty-one million, three hundred seventy-seven thousand, six hundred seventy-six".