120642640 has 20 divisors (see below), whose sum is σ = 280494324. Its totient is φ = 48257024.

The previous prime is 120642619. The next prime is 120642673. The reversal of 120642640 is 46246021.

It can be written as a sum of positive squares in 2 ways, for example, as 95961616 + 24681024 = 9796^2 + 4968^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 753937 + ... + 754096.

Almost surely, 2^120642640 is an apocalyptic number.

120642640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

120642640 is an abundant number, since it is smaller than the sum of its proper divisors (159851684).

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

120642640 is a wasteful number, since it uses less digits than its factorization.

120642640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1508046 (or 1508040 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 25.

The square root of 120642640 is about 10983.7443524510. The cubic root of 120642640 is about 494.1213402641.

Adding to 120642640 its reverse (46246021), we get a palindrome (166888661).

The spelling of 120642640 in words is "one hundred twenty million, six hundred forty-two thousand, six hundred forty".