120551640 has 128 divisors (see below), whose sum is σ = 397163520. Its totient is φ = 29030400.

The previous prime is 120551623. The next prime is 120551647. The reversal of 120551640 is 46155021.

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 120551640.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (120551647) 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, 357552 + ... + 357888.

It is an arithmetic number, because the mean of its divisors is an integer number (3102840).

Almost surely, 2^120551640 is an apocalyptic number.

120551640 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 120551640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (198581760).

120551640 is an abundant number, since it is smaller than the sum of its proper divisors (276611880).

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

120551640 is a wasteful number, since it uses less digits than its factorization.

120551640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 633 (or 629 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 24.

The square root of 120551640 is about 10979.6010856497. The cubic root of 120551640 is about 493.9970714530.

It can be divided in two parts, 12055 and 1640, that added together give a triangular number (13695 = T₁₆₅).

The spelling of 120551640 in words is "one hundred twenty million, five hundred fifty-one thousand, six hundred forty".