99777557 has 4 divisors (see below), whose sum is σ = 108848256. Its totient is φ = 90706860.

The previous prime is 99777551. The next prime is 99777571. The reversal of 99777557 is 75577799.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 99777557 - 2⁴ = 99777541 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99777551) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4535333 + ... + 4535354.

It is an arithmetic number, because the mean of its divisors is an integer number (27212064).

Almost surely, 2^99777557 is an apocalyptic number.

It is an amenable number.

99777557 is a deficient number, since it is larger than the sum of its proper divisors (9070699).

99777557 is a wasteful number, since it uses less digits than its factorization.

99777557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9070698.

The product of its digits is 4862025, while the sum is 56.

The square root of 99777557 is about 9988.8716580002. The cubic root of 99777557 is about 463.8144648750.

The spelling of 99777557 in words is "ninety-nine million, seven hundred seventy-seven thousand, five hundred fifty-seven".