90877889 has 2 divisors, whose sum is σ = 90877890. Its totient is φ = 90877888.

The previous prime is 90877867. The next prime is 90877939. The reversal of 90877889 is 98877809.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 83631025 + 7246864 = 9145^2 + 2692^2 .

It is a cyclic number.

It is not a de Polignac number, because 90877889 - 2¹² = 90873793 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (90877819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45438944 + 45438945.

It is an arithmetic number, because the mean of its divisors is an integer number (45438945).

Almost surely, 2^90877889 is an apocalyptic number.

It is an amenable number.

90877889 is a deficient number, since it is larger than the sum of its proper divisors (1).

90877889 is an equidigital number, since it uses as much as digits as its factorization.

90877889 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2032128, while the sum is 56.

The square root of 90877889 is about 9532.9895101170. The cubic root of 90877889 is about 449.5928646792.

The spelling of 90877889 in words is "ninety million, eight hundred seventy-seven thousand, eight hundred eighty-nine".