81118464 has 144 divisors (see below), whose sum is σ = 251166720. Its totient is φ = 22763520.

The previous prime is 81118463. The next prime is 81118469. The reversal of 81118464 is 46481118.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81118463) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 424609 + ... + 424799.

Almost surely, 2^81118464 is an apocalyptic number.

81118464 is a gapful number since it is divisible by the number (84) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81118464, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (125583360).

81118464 is an abundant number, since it is smaller than the sum of its proper divisors (170048256).

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

81118464 is a wasteful number, since it uses less digits than its factorization.

81118464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 296 (or 282 counting only the distinct ones).

The product of its digits is 6144, while the sum is 33.

The square root of 81118464 is about 9006.5789287609. The cubic root of 81118464 is about 432.8857000157.

The spelling of 81118464 in words is "eighty-one million, one hundred eighteen thousand, four hundred sixty-four".