80971840 has 56 divisors (see below), whose sum is σ = 195315840. Its totient is φ = 31968768.

The previous prime is 80971831. The next prime is 80971841. The reversal of 80971840 is 4817908.

It is a self number, because there is not a number n which added to its sum of digits gives 80971840.

It is not an unprimeable number, because it can be changed into a prime (80971841) 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, 23679 + ... + 26881.

Almost surely, 2^80971840 is an apocalyptic number.

80971840 is a gapful number since it is divisible by the number (80) 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 80971840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (97657920).

80971840 is an abundant number, since it is smaller than the sum of its proper divisors (114344000).

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

80971840 is a wasteful number, since it uses less digits than its factorization.

80971840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3299 (or 3289 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 37.

The square root of 80971840 is about 8998.4354195604. The cubic root of 80971840 is about 432.6247248511.

The spelling of 80971840 in words is "eighty million, nine hundred seventy-one thousand, eight hundred forty".