11398735728 has 60 divisors (see below), whose sum is σ = 32376784648. Its totient is φ = 3742865280.

The previous prime is 11398735723. The next prime is 11398735757. The reversal of 11398735728 is 82753789311.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11398735723) by changing a digit.

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, 581083 + ... + 600378.

Almost surely, 2^11398735728 is an apocalyptic number.

11398735728 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

11398735728 is an abundant number, since it is smaller than the sum of its proper divisors (20978048920).

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

11398735728 is a wasteful number, since it uses less digits than its factorization.

11398735728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1181542 (or 1181533 counting only the distinct ones).

The product of its digits is 2540160, while the sum is 54.

The spelling of 11398735728 in words is "eleven billion, three hundred ninety-eight million, seven hundred thirty-five thousand, seven hundred twenty-eight".