87221012278 has 32 divisors (see below), whose sum is σ = 133749688320. Its totient is φ = 42646202880.

The previous prime is 87221012237. The next prime is 87221012287.

87221012278 is nontrivially palindromic in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 87221012278.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18662550 + ... + 18667222.

It is an arithmetic number, because the mean of its divisors is an integer number (4179677760).

Almost surely, 2^87221012278 is an apocalyptic number.

87221012278 is a deficient number, since it is larger than the sum of its proper divisors (46528676042).

87221012278 is a wasteful number, since it uses less digits than its factorization.

87221012278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5532.

The product of its (nonzero) digits is 50176, while the sum is 40.

It can be divided in two parts, 872210 and 12278, that added together give a palindrome (884488).

The spelling of 87221012278 in words is "eighty-seven billion, two hundred twenty-one million, twelve thousand, two hundred seventy-eight".