99999970 has 16 divisors (see below), whose sum is σ = 205714368.
Its totient is φ = 34285680.
The previous prime is 99999959. The next prime is 99999971. The reversal of 99999970 is 7999999.
It is a nialpdrome in base 10.
It is a junction number, because it is equal to n+sod(n) for n = 99999899 and 99999908.
It is not an unprimeable number, because it can be changed into a prime (99999971) by changing a digit.
It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 714216 + ... + 714355.
It is an arithmetic number, because the mean of its divisors is an integer number (12857148).
Almost surely, 299999970 is an apocalyptic number.
99999970 is an abundant number, since it is smaller than the sum of its proper divisors (105714398).
99999970 is a wasteful number, since it uses less digits than its factorization.
99999970 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 1428585.
The product of its (nonzero) digits is 3720087, while the sum is 61.
The square root of 99999970 is about 9999.9984999999.
The cubic root of 99999970 is about 464.1588369454.
The spelling of 99999970 in words is "ninety-nine million, nine hundred ninety-nine thousand, nine hundred seventy".