87969681 has 6 divisors (see below), whose sum is σ = 127067330. Its totient is φ = 58646448.

The previous prime is 87969659. The next prime is 87969689. The reversal of 87969681 is 18696978.

It can be written as a sum of positive squares in only one way, i.e., 51969681 + 36000000 = 7209^2 + 6000^2 .

It is not a de Polignac number, because 87969681 - 2⁶ = 87969617 is a prime.

It is a super-2 number, since 2×87969681² = 15477329550483522, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (87969689) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4887196 + ... + 4887213.

Almost surely, 2^87969681 is an apocalyptic number.

It is an amenable number.

87969681 is a deficient number, since it is larger than the sum of its proper divisors (39097649).

87969681 is a wasteful number, since it uses less digits than its factorization.

87969681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9774415 (or 9774412 counting only the distinct ones).

The product of its digits is 1306368, while the sum is 54.

The square root of 87969681 is about 9379.2153723006. The cubic root of 87969681 is about 444.7449297823.

The spelling of 87969681 in words is "eighty-seven million, nine hundred sixty-nine thousand, six hundred eighty-one".