136244730640 has 80 divisors (see below), whose sum is σ = 346968172080. Its totient is φ = 49523425280.

The previous prime is 136244730617. The next prime is 136244730649. The reversal of 136244730640 is 46037442631.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 22573259536 + 113671471104 = 150244^2 + 337152^2 .

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 136244730593 and 136244730602.

It is not an unprimeable number, because it can be changed into a prime (136244730649) 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 15 ways as a sum of consecutive naturals, for example, 1687801 + ... + 1766680.

It is an arithmetic number, because the mean of its divisors is an integer number (4337102151).

Almost surely, 2^136244730640 is an apocalyptic number.

136244730640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

136244730640 is an abundant number, since it is smaller than the sum of its proper divisors (210723441440).

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

136244730640 is a wasteful number, since it uses less digits than its factorization.

136244730640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3454540 (or 3454534 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 40.

The spelling of 136244730640 in words is "one hundred thirty-six billion, two hundred forty-four million, seven hundred thirty thousand, six hundred forty".