123210632640 has 56 divisors (see below), whose sum is σ = 391193761680. Its totient is φ = 32856168448.

The previous prime is 123210632639. The next prime is 123210632683. The reversal of 123210632640 is 46236012321.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 123210632598 and 123210632607.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 64171245 + ... + 64173164.

Almost surely, 2^123210632640 is an apocalyptic number.

123210632640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123210632640 is an abundant number, since it is smaller than the sum of its proper divisors (267983129040).

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

123210632640 is a wasteful number, since it uses less digits than its factorization.

123210632640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128344429 (or 128344419 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 30.

Adding to 123210632640 its reverse (46236012321), we get a palindrome (169446644961).

The spelling of 123210632640 in words is "one hundred twenty-three billion, two hundred ten million, six hundred thirty-two thousand, six hundred forty".