87731329157 has 6 divisors (see below), whose sum is σ = 93195564498. Its totient is φ = 82570662464.

The previous prime is 87731329139. The next prime is 87731329159. The reversal of 87731329157 is 75192313778.

It can be written as a sum of positive squares in 3 ways, for example, as 13415662276 + 74315666881 = 115826^2 + 272609^2 .

It is not a de Polignac number, because 87731329157 - 2¹² = 87731325061 is a prime.

It is a super-2 number, since 2×87731329157² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 87731329099 and 87731329108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87731329159) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 151784018 + ... + 151784595.

It is an arithmetic number, because the mean of its divisors is an integer number (15532594083).

Almost surely, 2^87731329157 is an apocalyptic number.

It is an amenable number.

87731329157 is a deficient number, since it is larger than the sum of its proper divisors (5464235341).

87731329157 is a wasteful number, since it uses less digits than its factorization.

87731329157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 303568647 (or 303568630 counting only the distinct ones).

The product of its digits is 2222640, while the sum is 53.

The spelling of 87731329157 in words is "eighty-seven billion, seven hundred thirty-one million, three hundred twenty-nine thousand, one hundred fifty-seven".