99999770 has 32 divisors (see below), whose sum is σ = 194615568. Its totient is φ = 36776448.

The previous prime is 99999721. The next prime is 99999773. The reversal of 99999770 is 7799999.

It can be written as a sum of positive squares in 8 ways, for example, as 2247001 + 97752769 = 1499^2 + 9887^2 .

It is a nialpdrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (99999773) 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, 34622 + ... + 37398.

Almost surely, 2^99999770 is an apocalyptic number.

99999770 is a deficient number, since it is larger than the sum of its proper divisors (94615798).

99999770 is a wasteful number, since it uses less digits than its factorization.

99999770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3074.

The product of its (nonzero) digits is 2893401, while the sum is 59.

The square root of 99999770 is about 9999.9884999934. The cubic root of 99999770 is about 464.1585275059.

The spelling of 99999770 in words is "ninety-nine million, nine hundred ninety-nine thousand, seven hundred seventy".