87977477978 has 16 divisors (see below), whose sum is σ = 142124236800. Its totient is φ = 40603054896.

The previous prime is 87977477947. The next prime is 87977477983.

87977477978 is nontrivially palindromic in base 10.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 576551 + ... + 712997.

It is an arithmetic number, because the mean of its divisors is an integer number (8882764800).

Almost surely, 2^87977477978 is an apocalyptic number.

87977477978 is a deficient number, since it is larger than the sum of its proper divisors (54146758822).

87977477978 is a wasteful number, since it uses less digits than its factorization.

87977477978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161261.

The product of its digits is 2439569664, while the sum is 80.

The spelling of 87977477978 in words is "eighty-seven billion, nine hundred seventy-seven million, four hundred seventy-seven thousand, nine hundred seventy-eight".