8778730087 has 4 divisors (see below), whose sum is σ = 8787942720. Its totient is φ = 8769517456.

The previous prime is 8778730057. The next prime is 8778730097. The reversal of 8778730087 is 7800378778.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7800378778 = 2 ⋅3900189389.

It is a cyclic number.

It is not a de Polignac number, because 8778730087 - 2⁷ = 8778729959 is a prime.

It is a super-2 number, since 2×8778730087² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8778730057) 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, 4604887 + ... + 4606792.

It is an arithmetic number, because the mean of its divisors is an integer number (2196985680).

Almost surely, 2^8778730087 is an apocalyptic number.

8778730087 is a deficient number, since it is larger than the sum of its proper divisors (9212633).

8778730087 is an equidigital number, since it uses as much as digits as its factorization.

8778730087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9212632.

The product of its (nonzero) digits is 3687936, while the sum is 55.

The square root of 8778730087 is about 93694.8775921075. The cubic root of 8778730087 is about 2062.8955171304.

The spelling of 8778730087 in words is "eight billion, seven hundred seventy-eight million, seven hundred thirty thousand, eighty-seven".