99778499 has 4 divisors (see below), whose sum is σ = 101469720. Its totient is φ = 98087280.

The previous prime is 99778487. The next prime is 99778507. The reversal of 99778499 is 99487799.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99487799 = 113 ⋅880423.

It is a cyclic number.

It is not a de Polignac number, because 99778499 - 2²⁴ = 83001283 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99778099) 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, 845522 + ... + 845639.

It is an arithmetic number, because the mean of its divisors is an integer number (25367430).

Almost surely, 2^99778499 is an apocalyptic number.

99778499 is a deficient number, since it is larger than the sum of its proper divisors (1691221).

99778499 is a wasteful number, since it uses less digits than its factorization.

99778499 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1691220.

The product of its digits is 10287648, while the sum is 62.

The square root of 99778499 is about 9988.9188103618. The cubic root of 99778499 is about 463.8159244946.

The spelling of 99778499 in words is "ninety-nine million, seven hundred seventy-eight thousand, four hundred ninety-nine".