87768818 has 4 divisors (see below), whose sum is σ = 131653230. Its totient is φ = 43884408.

The previous prime is 87768803. The next prime is 87768829. The reversal of 87768818 is 81886778.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 86359849 + 1408969 = 9293^2 + 1187^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 87768818.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21942203 + ... + 21942206.

Almost surely, 2^87768818 is an apocalyptic number.

87768818 is a deficient number, since it is larger than the sum of its proper divisors (43884412).

87768818 is a wasteful number, since it uses less digits than its factorization.

87768818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43884411.

The product of its digits is 1204224, while the sum is 53.

The square root of 87768818 is about 9368.5013742861. The cubic root of 87768818 is about 444.4061733759.

The spelling of 87768818 in words is "eighty-seven million, seven hundred sixty-eight thousand, eight hundred eighteen".