90578773 has 2 divisors, whose sum is σ = 90578774. Its totient is φ = 90578772.

The previous prime is 90578759. The next prime is 90578779. The reversal of 90578773 is 37787509.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 88679889 + 1898884 = 9417^2 + 1378^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90578773 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90578779) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45289386 + 45289387.

It is an arithmetic number, because the mean of its divisors is an integer number (45289387).

Almost surely, 2^90578773 is an apocalyptic number.

It is an amenable number.

90578773 is a deficient number, since it is larger than the sum of its proper divisors (1).

90578773 is an equidigital number, since it uses as much as digits as its factorization.

90578773 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 370440, while the sum is 46.

The square root of 90578773 is about 9517.2881116419. The cubic root of 90578773 is about 449.0990583405.

The spelling of 90578773 in words is "ninety million, five hundred seventy-eight thousand, seven hundred seventy-three".