87381627991 has 16 divisors (see below), whose sum is σ = 104347814400. Its totient is φ = 71545038048.

The previous prime is 87381627989. The next prime is 87381627997. The reversal of 87381627991 is 19972618378.

It is a cyclic number.

It is not a de Polignac number, because 87381627991 - 2¹ = 87381627989 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 (87381627997) 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, 248236 + ... + 486193.

It is an arithmetic number, because the mean of its divisors is an integer number (6521738400).

Almost surely, 2^87381627991 is an apocalyptic number.

87381627991 is a deficient number, since it is larger than the sum of its proper divisors (16966186409).

87381627991 is a wasteful number, since it uses less digits than its factorization.

87381627991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 735198.

The product of its digits is 9144576, while the sum is 61.

The spelling of 87381627991 in words is "eighty-seven billion, three hundred eighty-one million, six hundred twenty-seven thousand, nine hundred ninety-one".