87211278 has 144 divisors (see below), whose sum is σ = 244885680. Its totient is φ = 22176000.

The previous prime is 87211249. The next prime is 87211279.

It is a happy number.

87211278 is nontrivially palindromic in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87211279) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 863428 + ... + 863528.

It is an arithmetic number, because the mean of its divisors is an integer number (1700595).

Almost surely, 2^87211278 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 87211278, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (122442840).

87211278 is an abundant number, since it is smaller than the sum of its proper divisors (157674402).

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

87211278 is a wasteful number, since it uses less digits than its factorization.

87211278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 223 (or 213 counting only the distinct ones).

The product of its digits is 12544, while the sum is 36.

The square root of 87211278 is about 9338.6978749716. The cubic root of 87211278 is about 443.4631629608.

It can be divided in two parts, 8721 and 1278, that added together give a palindrome (9999).

The spelling of 87211278 in words is "eighty-seven million, two hundred eleven thousand, two hundred seventy-eight".