87911978 has 24 divisors (see below), whose sum is σ = 167344704. Its totient is φ = 34251000.

The previous prime is 87911953. The next prime is 87911983.

87911978 is nontrivially palindromic in base 10.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 39698 + ... + 41853.

It is an arithmetic number, because the mean of its divisors is an integer number (6972696).

Almost surely, 2^87911978 is an apocalyptic number.

87911978 is a deficient number, since it is larger than the sum of its proper divisors (79432726).

87911978 is a wasteful number, since it uses less digits than its factorization.

87911978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81578 (or 81571 counting only the distinct ones).

The product of its digits is 254016, while the sum is 50.

The square root of 87911978 is about 9376.1387575057. The cubic root of 87911978 is about 444.6476662342.

The spelling of 87911978 in words is "eighty-seven million, nine hundred eleven thousand, nine hundred seventy-eight".