87911211978 has 32 divisors (see below), whose sum is σ = 198669412800. Its totient is φ = 28807062768.

The previous prime is 87911211977. The next prime is 87911212001.

87911211978 is nontrivially palindromic in base 10.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (87911211977) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13793301 + ... + 13799672.

It is an arithmetic number, because the mean of its divisors is an integer number (6208419150).

Almost surely, 2^87911211978 is an apocalyptic number.

87911211978 is an abundant number, since it is smaller than the sum of its proper divisors (110758200822).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

87911211978 is a wasteful number, since it uses less digits than its factorization.

87911211978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27593043 (or 27593037 counting only the distinct ones).

The product of its digits is 508032, while the sum is 54.

The spelling of 87911211978 in words is "eighty-seven billion, nine hundred eleven million, two hundred eleven thousand, nine hundred seventy-eight".