120542640 has 40 divisors (see below), whose sum is σ = 373682928. Its totient is φ = 32144640.

The previous prime is 120542603. The next prime is 120542687. The reversal of 120542640 is 46245021.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 120542640.

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, 250891 + ... + 251370.

Almost surely, 2^120542640 is an apocalyptic number.

120542640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

120542640 is an abundant number, since it is smaller than the sum of its proper divisors (253140288).

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

120542640 is a wasteful number, since it uses less digits than its factorization.

120542640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 502277 (or 502271 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 120542640 is about 10979.1912270440. The cubic root of 120542640 is about 493.9847777331.

Adding to 120542640 its reverse (46245021), we get a palindrome (166787661).

The spelling of 120542640 in words is "one hundred twenty million, five hundred forty-two thousand, six hundred forty".