99778559 has 8 divisors (see below), whose sum is σ = 105738048. Its totient is φ = 93829120.

The previous prime is 99778541. The next prime is 99778561. The reversal of 99778559 is 95587799.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 99778559 - 2¹⁶ = 99713023 is a prime.

It is a super-2 number, since 2×99778559² = 19911521672232962, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 99778498 and 99778507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99774559) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30239 + ... + 33375.

It is an arithmetic number, because the mean of its divisors is an integer number (13217256).

Almost surely, 2^99778559 is an apocalyptic number.

99778559 is a deficient number, since it is larger than the sum of its proper divisors (5959489).

99778559 is a wasteful number, since it uses less digits than its factorization.

99778559 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5025.

The product of its digits is 7144200, while the sum is 59.

The square root of 99778559 is about 9988.9218136894. The cubic root of 99778559 is about 463.8160174637.

The spelling of 99778559 in words is "ninety-nine million, seven hundred seventy-eight thousand, five hundred fifty-nine".