80887581 has 24 divisors (see below), whose sum is σ = 124296120. Its totient is φ = 50512896.

The previous prime is 80887571. The next prime is 80887603. The reversal of 80887581 is 18578808.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 695556 + 80192025 = 834^2 + 8955^2 .

It is not a de Polignac number, because 80887581 - 2¹³ = 80879389 is a prime.

It is a super-2 number, since 2×80887581² = 13085601520063122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80887501) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 34515 + ... + 36783.

It is an arithmetic number, because the mean of its divisors is an integer number (5179005).

Almost surely, 2^80887581 is an apocalyptic number.

It is an amenable number.

80887581 is a deficient number, since it is larger than the sum of its proper divisors (43408539).

80887581 is a wasteful number, since it uses less digits than its factorization.

80887581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2525 (or 2522 counting only the distinct ones).

The product of its (nonzero) digits is 143360, while the sum is 45.

The square root of 80887581 is about 8993.7523314799. The cubic root of 80887581 is about 432.4746102016.

The spelling of 80887581 in words is "eighty million, eight hundred eighty-seven thousand, five hundred eighty-one".