87788779 has 8 divisors (see below), whose sum is σ = 94886960. Its totient is φ = 80739936.

The previous prime is 87788773. The next prime is 87788791. The reversal of 87788779 is 97788778.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 87788779 - 2⁵ = 87788747 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87788773) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8589 + ... + 15790.

It is an arithmetic number, because the mean of its divisors is an integer number (11860870).

Almost surely, 2^87788779 is an apocalyptic number.

87788779 is a deficient number, since it is larger than the sum of its proper divisors (7098181).

87788779 is a wasteful number, since it uses less digits than its factorization.

87788779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24669.

The product of its digits is 11063808, while the sum is 61.

The square root of 87788779 is about 9369.5666388580. The cubic root of 87788779 is about 444.4398608115.

Subtracting 87788779 from its reverse (97788778), we obtain a palindrome (9999999).

The spelling of 87788779 in words is "eighty-seven million, seven hundred eighty-eight thousand, seven hundred seventy-nine".