87228636431 has 4 divisors (see below), whose sum is σ = 87242127000. Its totient is φ = 87215145864.

The previous prime is 87228636413. The next prime is 87228636487. The reversal of 87228636431 is 13463682278.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13463682278 = 2 ⋅6731841139.

It is a cyclic number.

It is not a de Polignac number, because 87228636431 - 2¹⁰ = 87228635407 is a prime.

It is a super-2 number, since 2×87228636431² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 87228636431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87228636031) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6735581 + ... + 6748518.

It is an arithmetic number, because the mean of its divisors is an integer number (21810531750).

Almost surely, 2^87228636431 is an apocalyptic number.

87228636431 is a deficient number, since it is larger than the sum of its proper divisors (13490569).

87228636431 is a wasteful number, since it uses less digits than its factorization.

87228636431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13490568.

The product of its digits is 2322432, while the sum is 50.

The spelling of 87228636431 in words is "eighty-seven billion, two hundred twenty-eight million, six hundred thirty-six thousand, four hundred thirty-one".