87420271511 has 4 divisors (see below), whose sum is σ = 87421097400. Its totient is φ = 87419445624.

The previous prime is 87420271501. The next prime is 87420271541. The reversal of 87420271511 is 11517202478.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87420271511 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87420271501) 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, 225941 + ... + 475278.

It is an arithmetic number, because the mean of its divisors is an integer number (21855274350).

Almost surely, 2^87420271511 is an apocalyptic number.

87420271511 is a deficient number, since it is larger than the sum of its proper divisors (825889).

87420271511 is a wasteful number, since it uses less digits than its factorization.

87420271511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 825888.

The product of its (nonzero) digits is 31360, while the sum is 38.

Adding to 87420271511 its reverse (11517202478), we get a palindrome (98937473989).

The spelling of 87420271511 in words is "eighty-seven billion, four hundred twenty million, two hundred seventy-one thousand, five hundred eleven".