99987970 has 8 divisors (see below), whose sum is σ = 179978364. Its totient is φ = 39995184.

The previous prime is 99987961. The next prime is 99987973. The reversal of 99987970 is 7978999.

It can be written as a sum of positive squares in 2 ways, for example, as 99940009 + 47961 = 9997^2 + 219^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (99987973) by changing a digit.

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, 4999389 + ... + 4999408.

Almost surely, 2^99987970 is an apocalyptic number.

99987970 is a deficient number, since it is larger than the sum of its proper divisors (79990394).

99987970 is a wasteful number, since it uses less digits than its factorization.

99987970 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9998804.

The product of its (nonzero) digits is 2571912, while the sum is 58.

The square root of 99987970 is about 9999.3984819088. The cubic root of 99987970 is about 464.1402698436.

The spelling of 99987970 in words is "ninety-nine million, nine hundred eighty-seven thousand, nine hundred seventy".