75981681 has 12 divisors (see below), whose sum is σ = 110007040. Its totient is φ = 50536440.

The previous prime is 75981679. The next prime is 75981727. The reversal of 75981681 is 18618957.

It is not a de Polignac number, because 75981681 - 2¹ = 75981679 is a prime.

It is a super-2 number, since 2×75981681² = 11546431695171522, 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 (75981601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5665 + ... + 13566.

Almost surely, 2^75981681 is an apocalyptic number.

It is an amenable number.

75981681 is a deficient number, since it is larger than the sum of its proper divisors (34025359).

75981681 is a wasteful number, since it uses less digits than its factorization.

75981681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19676 (or 19673 counting only the distinct ones).

The product of its digits is 120960, while the sum is 45.

The square root of 75981681 is about 8716.7471570535. The cubic root of 75981681 is about 423.5483223344.

The spelling of 75981681 in words is "seventy-five million, nine hundred eighty-one thousand, six hundred eighty-one".