120645640 has 64 divisors (see below), whose sum is σ = 279187200. Its totient is φ = 46904832.

The previous prime is 120645631. The next prime is 120645653. The reversal of 120645640 is 46546021.

It is a junction number, because it is equal to n+sod(n) for n = 120645599 and 120645608.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 230419 + ... + 230941.

It is an arithmetic number, because the mean of its divisors is an integer number (4362300).

Almost surely, 2^120645640 is an apocalyptic number.

120645640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 120645640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (139593600).

120645640 is an abundant number, since it is smaller than the sum of its proper divisors (158541560).

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

120645640 is a wasteful number, since it uses less digits than its factorization.

120645640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 686 (or 682 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 28.

The square root of 120645640 is about 10983.8809170530. The cubic root of 120645640 is about 494.1254359739.

The spelling of 120645640 in words is "one hundred twenty million, six hundred forty-five thousand, six hundred forty".