99999764 has 12 divisors (see below), whose sum is σ = 178301844. Its totient is φ = 49056384.

The previous prime is 99999721. The next prime is 99999773. The reversal of 99999764 is 46799999.

It can be written as a sum of positive squares in 2 ways, for example, as 49589764 + 50410000 = 7042^2 + 7100^2 .

It is a nialpdrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 99999697 and 99999706.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 235637 + ... + 236060.

It is an arithmetic number, because the mean of its divisors is an integer number (14858487).

Almost surely, 2^99999764 is an apocalyptic number.

It is an amenable number.

99999764 is a deficient number, since it is larger than the sum of its proper divisors (78302080).

99999764 is a wasteful number, since it uses less digits than its factorization.

99999764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 471754 (or 471752 counting only the distinct ones).

The product of its digits is 9920232, while the sum is 62.

The square root of 99999764 is about 9999.9881999930. The cubic root of 99999764 is about 464.1585182227.

The spelling of 99999764 in words is "ninety-nine million, nine hundred ninety-nine thousand, seven hundred sixty-four".