620415240 has 64 divisors (see below), whose sum is σ = 1867924800. Its totient is φ = 164850432.

The previous prime is 620415197. The next prime is 620415251. The reversal of 620415240 is 42514026.

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 620415240.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24826 + ... + 43094.

It is an arithmetic number, because the mean of its divisors is an integer number (29186325).

Almost surely, 2^620415240 is an apocalyptic number.

620415240 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 620415240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (933962400).

620415240 is an abundant number, since it is smaller than the sum of its proper divisors (1247509560).

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

620415240 is a wasteful number, since it uses less digits than its factorization.

620415240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18566 (or 18562 counting only the distinct ones).

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

The square root of 620415240 is about 24908.1360201842. The cubic root of 620415240 is about 852.8922192524.

Adding to 620415240 its reverse (42514026), we get a palindrome (662929266).

The spelling of 620415240 in words is "six hundred twenty million, four hundred fifteen thousand, two hundred forty".