99278649 has 16 divisors (see below), whose sum is σ = 153475200. Its totient is φ = 63307728.

The previous prime is 99278639. The next prime is 99278653. The reversal of 99278649 is 94687299.

It is not a de Polignac number, because 99278649 - 2⁴ = 99278633 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 99278595 and 99278604.

It is not an unprimeable number, because it can be changed into a prime (99278639) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 79314 + ... + 80555.

It is an arithmetic number, because the mean of its divisors is an integer number (9592200).

Almost surely, 2^99278649 is an apocalyptic number.

It is an amenable number.

99278649 is a deficient number, since it is larger than the sum of its proper divisors (54196551).

99278649 is a wasteful number, since it uses less digits than its factorization.

99278649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159901 (or 159895 counting only the distinct ones).

The product of its digits is 1959552, while the sum is 54.

The square root of 99278649 is about 9963.8671709332. The cubic root of 99278649 is about 463.0401173747.

The spelling of 99278649 in words is "ninety-nine million, two hundred seventy-eight thousand, six hundred forty-nine".