90636988487 has 2 divisors, whose sum is σ = 90636988488. Its totient is φ = 90636988486.

The previous prime is 90636988483. The next prime is 90636988493. The reversal of 90636988487 is 78488963609.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 90636988487 - 2² = 90636988483 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90636988483) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45318494243 + 45318494244.

It is an arithmetic number, because the mean of its divisors is an integer number (45318494244).

Almost surely, 2^90636988487 is an apocalyptic number.

90636988487 is a deficient number, since it is larger than the sum of its proper divisors (1).

90636988487 is an equidigital number, since it uses as much as digits as its factorization.

90636988487 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 125411328, while the sum is 68.

The spelling of 90636988487 in words is "ninety billion, six hundred thirty-six million, nine hundred eighty-eight thousand, four hundred eighty-seven".