99278071 has 4 divisors (see below), whose sum is σ = 100156752. Its totient is φ = 98399392.

The previous prime is 99278041. The next prime is 99278077. The reversal of 99278071 is 17087299.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17087299 = 277 ⋅61687.

It is a cyclic number.

It is not a de Polignac number, because 99278071 - 2²⁵ = 65723639 is a prime.

It is a super-2 number, since 2×99278071² = 19712270762962082, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99278077) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 439171 + ... + 439396.

It is an arithmetic number, because the mean of its divisors is an integer number (25039188).

Almost surely, 2^99278071 is an apocalyptic number.

99278071 is a deficient number, since it is larger than the sum of its proper divisors (878681).

99278071 is a wasteful number, since it uses less digits than its factorization.

99278071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 878680.

The product of its (nonzero) digits is 63504, while the sum is 43.

The square root of 99278071 is about 9963.8381660884. The cubic root of 99278071 is about 463.0392187669.

The spelling of 99278071 in words is "ninety-nine million, two hundred seventy-eight thousand, seventy-one".