9778997487 has 16 divisors (see below), whose sum is σ = 14907497472. Its totient is φ = 5585685600.

The previous prime is 9778997477. The next prime is 9778997497. The reversal of 9778997487 is 7847998779.

9778997487 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (9778997477) and next prime (9778997497).

It is not a de Polignac number, because 9778997487 - 2¹⁰ = 9778996463 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9778997477) 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, 43764 + ... + 146537.

It is an arithmetic number, because the mean of its divisors is an integer number (931718592).

Almost surely, 2^9778997487 is an apocalyptic number.

9778997487 is a deficient number, since it is larger than the sum of its proper divisors (5128499985).

9778997487 is a wasteful number, since it uses less digits than its factorization.

9778997487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 192758.

The product of its digits is 448084224, while the sum is 75.

The square root of 9778997487 is about 98888.8137607080. The cubic root of 9778997487 is about 2138.4451312822.

The spelling of 9778997487 in words is "nine billion, seven hundred seventy-eight million, nine hundred ninety-seven thousand, four hundred eighty-seven".