80985977 has 8 divisors (see below), whose sum is σ = 85839336. Its totient is φ = 76142592.

The previous prime is 80985973. The next prime is 80985991. The reversal of 80985977 is 77958908.

It can be written as a sum of positive squares in 4 ways, for example, as 28987456 + 51998521 = 5384^2 + 7211^2 .

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

It is not a de Polignac number, because 80985977 - 2² = 80985973 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (80985973) 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, 20213 + ... + 23885.

It is an arithmetic number, because the mean of its divisors is an integer number (10729917).

Almost surely, 2^80985977 is an apocalyptic number.

It is an amenable number.

80985977 is a deficient number, since it is larger than the sum of its proper divisors (4853359).

80985977 is a wasteful number, since it uses less digits than its factorization.

80985977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4987.

The product of its (nonzero) digits is 1270080, while the sum is 53.

The square root of 80985977 is about 8999.2209107233. The cubic root of 80985977 is about 432.6499009281.

The spelling of 80985977 in words is "eighty million, nine hundred eighty-five thousand, nine hundred seventy-seven".