81134580288 has 56 divisors (see below), whose sum is σ = 214865894880. Its totient is φ = 27020001280.

The previous prime is 81134580287. The next prime is 81134580299. The reversal of 81134580288 is 88208543118.

It is a hoax number, since the sum of its digits (48) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is not an unprimeable number, because it can be changed into a prime (81134580287) 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, 15808 + ... + 403136.

It is an arithmetic number, because the mean of its divisors is an integer number (3836890980).

Almost surely, 2^81134580288 is an apocalyptic number.

It is an amenable number.

81134580288 is an abundant number, since it is smaller than the sum of its proper divisors (133731314592).

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

81134580288 is a wasteful number, since it uses less digits than its factorization.

81134580288 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 388435 (or 388425 counting only the distinct ones).

The product of its (nonzero) digits is 491520, while the sum is 48.

The spelling of 81134580288 in words is "eighty-one billion, one hundred thirty-four million, five hundred eighty thousand, two hundred eighty-eight".