87997079978 has 16 divisors (see below), whose sum is σ = 138951676320. Its totient is φ = 41680151856.

The previous prime is 87997079971. The next prime is 87997079999.

87997079978 is nontrivially palindromic in base 10.

It is not an unprimeable number, because it can be changed into a prime (87997079971) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 606476 + ... + 737432.

It is an arithmetic number, because the mean of its divisors is an integer number (8684479770).

Almost surely, 2^87997079978 is an apocalyptic number.

87997079978 is a deficient number, since it is larger than the sum of its proper divisors (50954596342).

87997079978 is a wasteful number, since it uses less digits than its factorization.

87997079978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148661.

The product of its (nonzero) digits is 1008189504, while the sum is 80.

The spelling of 87997079978 in words is "eighty-seven billion, nine hundred ninety-seven million, seventy-nine thousand, nine hundred seventy-eight".