9897557990 has 8 divisors (see below), whose sum is σ = 17815604400. Its totient is φ = 3959023192.

The previous prime is 9897557959. The next prime is 9897557993. The reversal of 9897557990 is 997557989.

It is a happy number.

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

It is a self number, because there is not a number n which added to its sum of digits gives 9897557990.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9897557993) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 494877890 + ... + 494877909.

It is an arithmetic number, because the mean of its divisors is an integer number (2226950550).

Almost surely, 2^9897557990 is an apocalyptic number.

9897557990 is a deficient number, since it is larger than the sum of its proper divisors (7918046410).

9897557990 is a wasteful number, since it uses less digits than its factorization.

9897557990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 989755806.

The product of its (nonzero) digits is 64297800, while the sum is 68.

The square root of 9897557990 is about 99486.4713918430. The cubic root of 9897557990 is about 2147.0526038236.

The spelling of 9897557990 in words is "nine billion, eight hundred ninety-seven million, five hundred fifty-seven thousand, nine hundred ninety".