99278906 has 4 divisors (see below), whose sum is σ = 148918362. Its totient is φ = 49639452.

The previous prime is 99278897. The next prime is 99278909. The reversal of 99278906 is 60987299.

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., 91489225 + 7789681 = 9565^2 + 2791^2 .

It is not an unprimeable number, because it can be changed into a prime (99278909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24819725 + ... + 24819728.

Almost surely, 2^99278906 is an apocalyptic number.

99278906 is a deficient number, since it is larger than the sum of its proper divisors (49639456).

99278906 is a wasteful number, since it uses less digits than its factorization.

99278906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49639455.

The product of its (nonzero) digits is 489888, while the sum is 50.

The square root of 99278906 is about 9963.8800675239. The cubic root of 99278906 is about 463.0405169275.

The spelling of 99278906 in words is "ninety-nine million, two hundred seventy-eight thousand, nine hundred six".