9978150690 has 24 divisors (see below), whose sum is σ = 25943192028. Its totient is φ = 2660840160.

The previous prime is 9978150661. The next prime is 9978150709. The reversal of 9978150690 is 960518799.

It can be written as a sum of positive squares in 2 ways, for example, as 9962634969 + 15515721 = 99813^2 + 3939^2 .

It is a super-2 number, since 2×9978150690² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 55434081 + ... + 55434260.

Almost surely, 2^9978150690 is an apocalyptic number.

9978150690 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

9978150690 is an abundant number, since it is smaller than the sum of its proper divisors (15965041338).

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

9978150690 is a wasteful number, since it uses less digits than its factorization.

9978150690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110868354 (or 110868351 counting only the distinct ones).

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

The square root of 9978150690 is about 99890.6937106756. The cubic root of 9978150690 is about 2152.8644488058.

The spelling of 9978150690 in words is "nine billion, nine hundred seventy-eight million, one hundred fifty thousand, six hundred ninety".