99867778 has 4 divisors (see below), whose sum is σ = 149801670. Its totient is φ = 49933888.

The previous prime is 99867763. The next prime is 99867799. The reversal of 99867778 is 87776899.

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

It can be written as a sum of positive squares in only one way, i.e., 94926049 + 4941729 = 9743^2 + 2223^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24966943 + ... + 24966946.

Almost surely, 2^99867778 is an apocalyptic number.

99867778 is a deficient number, since it is larger than the sum of its proper divisors (49933892).

99867778 is a wasteful number, since it uses less digits than its factorization.

99867778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49933891.

The product of its digits is 10668672, while the sum is 61.

The square root of 99867778 is about 9993.3867132219. The cubic root of 99867778 is about 463.9542197451.

The spelling of 99867778 in words is "ninety-nine million, eight hundred sixty-seven thousand, seven hundred seventy-eight".