99778967 has 4 divisors (see below), whose sum is σ = 105648336. Its totient is φ = 93909600.

The previous prime is 99778949. The next prime is 99778969. The reversal of 99778967 is 76987799.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 99778967 - 2¹⁰ = 99777943 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99778969) 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, 2934659 + ... + 2934692.

It is an arithmetic number, because the mean of its divisors is an integer number (26412084).

Almost surely, 2^99778967 is an apocalyptic number.

99778967 is a deficient number, since it is larger than the sum of its proper divisors (5869369).

99778967 is a wasteful number, since it uses less digits than its factorization.

99778967 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5869368.

The product of its digits is 12002256, while the sum is 62.

The square root of 99778967 is about 9988.9422362931. The cubic root of 99778967 is about 463.8166496526.

The spelling of 99778967 in words is "ninety-nine million, seven hundred seventy-eight thousand, nine hundred sixty-seven".