120644550 has 144 divisors (see below), whose sum is σ = 358289568. Its totient is φ = 28915200.

The previous prime is 120644543. The next prime is 120644551. The reversal of 120644550 is 55446021.

120644550 is a `hidden beast` number, since 1 + 206 + 4 + 455 + 0 = 666.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (120644551) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 239599 + ... + 240101.

It is an arithmetic number, because the mean of its divisors is an integer number (2488122).

Almost surely, 2^120644550 is an apocalyptic number.

120644550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 120644550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (179144784).

120644550 is an abundant number, since it is smaller than the sum of its proper divisors (237645018).

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

120644550 is a wasteful number, since it uses less digits than its factorization.

120644550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 575 (or 567 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

The square root of 120644550 is about 10983.8312987773. The cubic root of 120644550 is about 494.1239478738.

The spelling of 120644550 in words is "one hundred twenty million, six hundred forty-four thousand, five hundred fifty".