80987881 has 8 divisors (see below), whose sum is σ = 92348424. Its totient is φ = 70360320.

The previous prime is 80987867. The next prime is 80987897. The reversal of 80987881 is 18878908.

It can be written as a sum of positive squares in 4 ways, for example, as 15523600 + 65464281 = 3940^2 + 8091^2 .

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 80987881 - 2⁹ = 80987369 is a prime.

It is a super-2 number, since 2×80987881² = 13118073737740322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (80987381) 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, 183010 + ... + 183451.

It is an arithmetic number, because the mean of its divisors is an integer number (11543553).

Almost surely, 2^80987881 is an apocalyptic number.

It is an amenable number.

80987881 is a deficient number, since it is larger than the sum of its proper divisors (11360543).

80987881 is a wasteful number, since it uses less digits than its factorization.

80987881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 366491.

The product of its (nonzero) digits is 258048, while the sum is 49.

The square root of 80987881 is about 8999.3266970368. The cubic root of 80987881 is about 432.6532914696.

The spelling of 80987881 in words is "eighty million, nine hundred eighty-seven thousand, eight hundred eighty-one".