80981785 has 8 divisors (see below), whose sum is σ = 97239240. Its totient is φ = 64744704.

The previous prime is 80981783. The next prime is 80981801. The reversal of 80981785 is 58718908.

It can be written as a sum of positive squares in 4 ways, for example, as 646416 + 80335369 = 804^2 + 8963^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 80981785 - 2¹ = 80981783 is a prime.

It is not an unprimeable number, because it can be changed into a prime (80981783) 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, 5761 + ... + 13969.

It is an arithmetic number, because the mean of its divisors is an integer number (12154905).

Almost surely, 2^80981785 is an apocalyptic number.

It is an amenable number.

80981785 is a deficient number, since it is larger than the sum of its proper divisors (16257455).

80981785 is a wasteful number, since it uses less digits than its factorization.

80981785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10187.

The product of its (nonzero) digits is 161280, while the sum is 46.

The square root of 80981785 is about 8998.9879986585. The cubic root of 80981785 is about 432.6424358510.

The spelling of 80981785 in words is "eighty million, nine hundred eighty-one thousand, seven hundred eighty-five".