90778357 has 2 divisors, whose sum is σ = 90778358. Its totient is φ = 90778356.

The previous prime is 90778343. The next prime is 90778379. The reversal of 90778357 is 75387709.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 65918161 + 24860196 = 8119^2 + 4986^2 .

It is an emirp because it is prime and its reverse (75387709) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 90778357 - 2⁷ = 90778229 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90778307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45389178 + 45389179.

It is an arithmetic number, because the mean of its divisors is an integer number (45389179).

Almost surely, 2^90778357 is an apocalyptic number.

It is an amenable number.

90778357 is a deficient number, since it is larger than the sum of its proper divisors (1).

90778357 is an equidigital number, since it uses as much as digits as its factorization.

90778357 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 90778357 is about 9527.7676818865. The cubic root of 90778357 is about 449.4286691703.

The spelling of 90778357 in words is "ninety million, seven hundred seventy-eight thousand, three hundred fifty-seven".