90789649927 has 2 divisors, whose sum is σ = 90789649928. Its totient is φ = 90789649926.

The previous prime is 90789649921. The next prime is 90789649943. The reversal of 90789649927 is 72994698709.

It is a weak prime.

It is an emirp because it is prime and its reverse (72994698709) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 90789649927 - 2²⁷ = 90655432199 is a prime.

It is a super-2 number, since 2×90789649927² (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 (90789649921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45394824963 + 45394824964.

It is an arithmetic number, because the mean of its divisors is an integer number (45394824964).

Almost surely, 2^90789649927 is an apocalyptic number.

90789649927 is a deficient number, since it is larger than the sum of its proper divisors (1).

90789649927 is an equidigital number, since it uses as much as digits as its factorization.

90789649927 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 123451776, while the sum is 70.

The spelling of 90789649927 in words is "ninety billion, seven hundred eighty-nine million, six hundred forty-nine thousand, nine hundred twenty-seven".