80721888 has 96 divisors (see below), whose sum is σ = 231662592. Its totient is φ = 24460800.

The previous prime is 80721871. The next prime is 80721911. The reversal of 80721888 is 88812708.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (96).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 88153 + ... + 89063.

It is an arithmetic number, because the mean of its divisors is an integer number (2413152).

Almost surely, 2^80721888 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 80721888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (115831296).

80721888 is an abundant number, since it is smaller than the sum of its proper divisors (150940704).

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

80721888 is a wasteful number, since it uses less digits than its factorization.

80721888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1008 (or 1000 counting only the distinct ones).

The product of its (nonzero) digits is 57344, while the sum is 42.

The square root of 80721888 is about 8984.5360481218. The cubic root of 80721888 is about 432.1791095434.

The spelling of 80721888 in words is "eighty million, seven hundred twenty-one thousand, eight hundred eighty-eight".