81342288936 has 32 divisors (see below), whose sum is σ = 225950803200. Its totient is φ = 27114096240.

The previous prime is 81342288931. The next prime is 81342288943. The reversal of 81342288936 is 63988224318.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (81342288931) 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, 188292120 + ... + 188292551.

It is an arithmetic number, because the mean of its divisors is an integer number (7060962600).

Almost surely, 2^81342288936 is an apocalyptic number.

It is an amenable number.

81342288936 is an abundant number, since it is smaller than the sum of its proper divisors (144608514264).

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

81342288936 is a wasteful number, since it uses less digits than its factorization.

81342288936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 376584686 (or 376584676 counting only the distinct ones).

The product of its digits is 3981312, while the sum is 54.

The spelling of 81342288936 in words is "eighty-one billion, three hundred forty-two million, two hundred eighty-eight thousand, nine hundred thirty-six".