620145540 has 144 divisors (see below), whose sum is σ = 2155974912. Its totient is φ = 141343488.

The previous prime is 620145521. The next prime is 620145553. The reversal of 620145540 is 45541026.

620145540 is a `hidden beast` number, since 6 + 201 + 455 + 4 + 0 = 666.

620145540 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 852657 + ... + 853383.

It is an arithmetic number, because the mean of its divisors is an integer number (14972048).

Almost surely, 2^620145540 is an apocalyptic number.

620145540 is a gapful number since it is divisible by the number (60) 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 620145540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1077987456).

620145540 is an abundant number, since it is smaller than the sum of its proper divisors (1535829372).

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

620145540 is a wasteful number, since it uses less digits than its factorization.

620145540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1426 (or 1421 counting only the distinct ones).

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

The square root of 620145540 is about 24902.7215380167. The cubic root of 620145540 is about 852.7686147394.

Adding to 620145540 its reverse (45541026), we get a palindrome (665686566).

The spelling of 620145540 in words is "six hundred twenty million, one hundred forty-five thousand, five hundred forty".