90777557 has 16 divisors (see below), whose sum is σ = 99805440. Its totient is φ = 82060992.

The previous prime is 90777529. The next prime is 90777559. The reversal of 90777557 is 75577709.

It is not a de Polignac number, because 90777557 - 2⁶ = 90777493 is a prime.

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90777559) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 160958 + ... + 161520.

It is an arithmetic number, because the mean of its divisors is an integer number (6237840).

Almost surely, 2^90777557 is an apocalyptic number.

It is an amenable number.

90777557 is a deficient number, since it is larger than the sum of its proper divisors (9027883).

90777557 is a wasteful number, since it uses less digits than its factorization.

90777557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 812.

The product of its (nonzero) digits is 540225, while the sum is 47.

The square root of 90777557 is about 9527.7256992422. The cubic root of 90777557 is about 449.4273489437.

The spelling of 90777557 in words is "ninety million, seven hundred seventy-seven thousand, five hundred fifty-seven".