80681664 has 112 divisors (see below), whose sum is σ = 246083328. Its totient is φ = 22852608.

The previous prime is 80681663. The next prime is 80681669. The reversal of 80681664 is 46618608.

It is a tau number, because it is divible by the number of its divisors (112).

It is not an unprimeable number, because it can be changed into a prime (80681663) 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, 232339 + ... + 232685.

Almost surely, 2^80681664 is an apocalyptic number.

80681664 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 80681664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (123041664).

80681664 is an abundant number, since it is smaller than the sum of its proper divisors (165401664).

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

80681664 is a wasteful number, since it uses less digits than its factorization.

80681664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 542 (or 532 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 39.

The square root of 80681664 is about 8982.2972562702. The cubic root of 80681664 is about 432.1073121609.

The spelling of 80681664 in words is "eighty million, six hundred eighty-one thousand, six hundred sixty-four".