636235620540 has 96 divisors (see below), whose sum is σ = 1949945987136. Its totient is φ = 154044426240.

The previous prime is 636235620539. The next prime is 636235620547. The reversal of 636235620540 is 45026532636.

It is a junction number, because it is equal to n+sod(n) for n = 636235620492 and 636235620501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (636235620547) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6638377 + ... + 6733536.

It is an arithmetic number, because the mean of its divisors is an integer number (20311937366).

Almost surely, 2^636235620540 is an apocalyptic number.

636235620540 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

636235620540 is an abundant number, since it is smaller than the sum of its proper divisors (1313710366596).

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

636235620540 is a wasteful number, since it uses less digits than its factorization.

636235620540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13371999 (or 13371997 counting only the distinct ones).

The product of its (nonzero) digits is 777600, while the sum is 42.

The spelling of 636235620540 in words is "six hundred thirty-six billion, two hundred thirty-five million, six hundred twenty thousand, five hundred forty".