87639537127 has 2 divisors, whose sum is σ = 87639537128. Its totient is φ = 87639537126.

The previous prime is 87639537121. The next prime is 87639537221. The reversal of 87639537127 is 72173593678.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87639537127 is a prime.

It is a super-2 number, since 2×87639537127² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87639537121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43819768563 + 43819768564.

It is an arithmetic number, because the mean of its divisors is an integer number (43819768564).

Almost surely, 2^87639537127 is an apocalyptic number.

87639537127 is a deficient number, since it is larger than the sum of its proper divisors (1).

87639537127 is an equidigital number, since it uses as much as digits as its factorization.

87639537127 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13335840, while the sum is 58.

The spelling of 87639537127 in words is "eighty-seven billion, six hundred thirty-nine million, five hundred thirty-seven thousand, one hundred twenty-seven".