87777778 has 16 divisors (see below), whose sum is σ = 144472896. Its totient is φ = 39666640.

The previous prime is 87777773. The next prime is 87777799.

87777778 is nontrivially palindromic in base 10.

It is not an unprimeable number, because it can be changed into a prime (87777773) 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, 7726 + ... + 15337.

It is an arithmetic number, because the mean of its divisors is an integer number (9029556).

Almost surely, 2^87777778 is an apocalyptic number.

87777778 is a deficient number, since it is larger than the sum of its proper divisors (56695118).

87777778 is a wasteful number, since it uses less digits than its factorization.

87777778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23249.

The product of its digits is 7529536, while the sum is 58.

The square root of 87777778 is about 9368.9795602296. The cubic root of 87777778 is about 444.4212954656.

The spelling of 87777778 in words is "eighty-seven million, seven hundred seventy-seven thousand, seven hundred seventy-eight".