81090950684 has 24 divisors (see below), whose sum is σ = 149437669920. Its totient is φ = 38426819904.

The previous prime is 81090950683. The next prime is 81090950741. The reversal of 81090950684 is 48605909018.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81090950683) 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, 4033199 + ... + 4053254.

It is an arithmetic number, because the mean of its divisors is an integer number (6226569580).

Almost surely, 2^81090950684 is an apocalyptic number.

It is an amenable number.

81090950684 is a deficient number, since it is larger than the sum of its proper divisors (68346719236).

81090950684 is a wasteful number, since it uses less digits than its factorization.

81090950684 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8086589 (or 8086587 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 50.

The spelling of 81090950684 in words is "eighty-one billion, ninety million, nine hundred fifty thousand, six hundred eighty-four".