87816769 has 4 divisors (see below), whose sum is σ = 90649600. Its totient is φ = 84983940.

The previous prime is 87816749. The next prime is 87816787. The reversal of 87816769 is 96761878.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 96761878 = 2 ⋅48380939.

It is a cyclic number.

It is not a de Polignac number, because 87816769 - 2¹¹ = 87814721 is a prime.

It is a super-2 number, since 2×87816769² = 15423569835198722, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87816709) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1416369 + ... + 1416430.

It is an arithmetic number, because the mean of its divisors is an integer number (22662400).

Almost surely, 2^87816769 is an apocalyptic number.

It is an amenable number.

87816769 is a deficient number, since it is larger than the sum of its proper divisors (2832831).

87816769 is a wasteful number, since it uses less digits than its factorization.

87816769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2832830.

The product of its digits is 1016064, while the sum is 52.

The square root of 87816769 is about 9371.0601854860. The cubic root of 87816769 is about 444.4870898917.

The spelling of 87816769 in words is "eighty-seven million, eight hundred sixteen thousand, seven hundred sixty-nine".