9987620945 has 8 divisors (see below), whose sum is σ = 11986805544. Its totient is φ = 7988989824.

The previous prime is 9987620941. The next prime is 9987620953. The reversal of 9987620945 is 5490267899.

9987620945 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 2938507264 + 7049113681 = 54208^2 + 83959^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 9987620945 - 2² = 9987620941 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9987620941) 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 7 ways as a sum of consecutive naturals, for example, 97574 + ... + 171743.

It is an arithmetic number, because the mean of its divisors is an integer number (1498350693).

Almost surely, 2^9987620945 is an apocalyptic number.

It is an amenable number.

9987620945 is a deficient number, since it is larger than the sum of its proper divisors (1999184599).

9987620945 is a wasteful number, since it uses less digits than its factorization.

9987620945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 276739.

The product of its (nonzero) digits is 9797760, while the sum is 59.

The square root of 9987620945 is about 99938.0855580094. The cubic root of 9987620945 is about 2153.5453274312.

The spelling of 9987620945 in words is "nine billion, nine hundred eighty-seven million, six hundred twenty thousand, nine hundred forty-five".