87272810381 has 4 divisors (see below), whose sum is σ = 87909838332. Its totient is φ = 86635782432.

The previous prime is 87272810323. The next prime is 87272810389. The reversal of 87272810381 is 18301827278.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 41180584900 + 46092225481 = 202930^2 + 214691^2 .

It is a cyclic number.

It is not a de Polignac number, because 87272810381 - 2¹⁰ = 87272809357 is a prime.

It is a super-2 number, since 2×87272810381² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87272810389) 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, 318513770 + ... + 318514043.

It is an arithmetic number, because the mean of its divisors is an integer number (21977459583).

Almost surely, 2^87272810381 is an apocalyptic number.

It is an amenable number.

87272810381 is a deficient number, since it is larger than the sum of its proper divisors (637027951).

87272810381 is a wasteful number, since it uses less digits than its factorization.

87272810381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 637027950.

The product of its (nonzero) digits is 301056, while the sum is 47.

The spelling of 87272810381 in words is "eighty-seven billion, two hundred seventy-two million, eight hundred ten thousand, three hundred eighty-one".