9378991512 has 256 divisors, whose sum is σ = 29393280000. Its totient is φ = 2746598400.

The previous prime is 9378991487. The next prime is 9378991513. The reversal of 9378991512 is 2151998739.

9378991512 is a `hidden beast` number, since 9 + 37 + 8 + 9 + 91 + 512 = 666.

It is a super-2 number, since 2×9378991512² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9378991513) 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 63 ways as a sum of consecutive naturals, for example, 8940364 + ... + 8941412.

It is an arithmetic number, because the mean of its divisors is an integer number (114817500).

Almost surely, 2^9378991512 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9378991512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14696640000).

9378991512 is an abundant number, since it is smaller than the sum of its proper divisors (20014288488).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

9378991512 is a wasteful number, since it uses less digits than its factorization.

9378991512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1199 (or 1189 counting only the distinct ones).

The product of its digits is 1224720, while the sum is 54.

The square root of 9378991512 is about 96845.1935410323. The cubic root of 9378991512 is about 2108.8808716039.

The spelling of 9378991512 in words is "nine billion, three hundred seventy-eight million, nine hundred ninety-one thousand, five hundred twelve".