80817660 has 360 divisors, whose sum is σ = 330338736. Its totient is φ = 15805440.

The previous prime is 80817641. The next prime is 80817661. The reversal of 80817660 is 6671808.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a Saint-Exupery number, since it is equal to the product of the sides of a Pythagorean triangle: 595 × 539 × 252.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80817661) by changing a digit.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 4753972 + ... + 4753988.

Almost surely, 2^80817660 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 80817660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (165169368).

80817660 is an abundant number, since it is smaller than the sum of its proper divisors (249521076).

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

80817660 is a wasteful number, since it uses less digits than its factorization.

80817660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71 (or 45 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 36.

The square root of 80817660 is about 8989.8642926353. The cubic root of 80817660 is about 432.3499607638.

The spelling of 80817660 in words is "eighty million, eight hundred seventeen thousand, six hundred sixty".