99428247 has 6 divisors (see below), whose sum is σ = 143618592. Its totient is φ = 66285492.

The previous prime is 99428237. The next prime is 99428299. The reversal of 99428247 is 74282499.

It is not a de Polignac number, because 99428247 - 2²⁶ = 32319383 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99428237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5523783 + ... + 5523800.

It is an arithmetic number, because the mean of its divisors is an integer number (23936432).

Almost surely, 2^99428247 is an apocalyptic number.

99428247 is a deficient number, since it is larger than the sum of its proper divisors (44190345).

99428247 is a wasteful number, since it uses less digits than its factorization.

99428247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11047589 (or 11047586 counting only the distinct ones).

The product of its digits is 290304, while the sum is 45.

The square root of 99428247 is about 9971.3713700774. The cubic root of 99428247 is about 463.2725779362.

It can be divided in two parts, 994 and 28247, that added together give a square (29241 = 171²).

The spelling of 99428247 in words is "ninety-nine million, four hundred twenty-eight thousand, two hundred forty-seven".