135639074640 has 80 divisors (see below), whose sum is σ = 423303264000. Its totient is φ = 35927655936.

The previous prime is 135639074639. The next prime is 135639074647. The reversal of 135639074640 is 46470936531.

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

It is a super-2 number, since 2×135639074640² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 135639074640.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135639074647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1860760 + ... + 1932279.

It is an arithmetic number, because the mean of its divisors is an integer number (5291290800).

Almost surely, 2^135639074640 is an apocalyptic number.

135639074640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

135639074640 is an abundant number, since it is smaller than the sum of its proper divisors (287664189360).

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

135639074640 is a wasteful number, since it uses less digits than its factorization.

135639074640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3793204 (or 3793198 counting only the distinct ones).

The product of its (nonzero) digits is 1632960, while the sum is 48.

The spelling of 135639074640 in words is "one hundred thirty-five billion, six hundred thirty-nine million, seventy-four thousand, six hundred forty".