90578989 has 2 divisors, whose sum is σ = 90578990. Its totient is φ = 90578988.

The previous prime is 90578959. The next prime is 90579017. The reversal of 90578989 is 98987509.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65076489 + 25502500 = 8067^2 + 5050^2 .

It is a cyclic number.

It is not a de Polignac number, because 90578989 - 2¹³ = 90570797 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90578959) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45289494 + 45289495.

It is an arithmetic number, because the mean of its divisors is an integer number (45289495).

Almost surely, 2^90578989 is an apocalyptic number.

It is an amenable number.

90578989 is a deficient number, since it is larger than the sum of its proper divisors (1).

90578989 is an equidigital number, since it uses as much as digits as its factorization.

90578989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1632960, while the sum is 55.

The square root of 90578989 is about 9517.2994594055. The cubic root of 90578989 is about 449.0994153238.

The spelling of 90578989 in words is "ninety million, five hundred seventy-eight thousand, nine hundred eighty-nine".