9999977440 has 24 divisors (see below), whose sum is σ = 23624947080. Its totient is φ = 3999990912.

The previous prime is 9999977417. The next prime is 9999977441. The reversal of 9999977440 is 447799999.

It is a Smith number, since the sum of its digits (67) coincides with the sum of the digits of its prime factors.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9999977441) 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, 31249770 + ... + 31250089.

It is an arithmetic number, because the mean of its divisors is an integer number (984372795).

Almost surely, 2^9999977440 is an apocalyptic number.

It is an amenable number.

9999977440 is an abundant number, since it is smaller than the sum of its proper divisors (13624969640).

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

9999977440 is a wasteful number, since it uses less digits than its factorization.

9999977440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62499874 (or 62499866 counting only the distinct ones).

The product of its (nonzero) digits is 46294416, while the sum is 67.

The square root of 9999977440 is about 99999.8871999364. The cubic root of 9999977440 is about 2154.4330698958.

The spelling of 9999977440 in words is "nine billion, nine hundred ninety-nine million, nine hundred seventy-seven thousand, four hundred forty".