620601640 has 96 divisors (see below), whose sum is σ = 1477173600. Its totient is φ = 234622080.

The previous prime is 620601623. The next prime is 620601649. The reversal of 620601640 is 46106026.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (620601649) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2941135 + ... + 2941345.

It is an arithmetic number, because the mean of its divisors is an integer number (15387225).

Almost surely, 2^620601640 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 620601640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (738586800).

620601640 is an abundant number, since it is smaller than the sum of its proper divisors (856571960).

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

620601640 is a wasteful number, since it uses less digits than its factorization.

620601640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 407 (or 380 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 620601640 is about 24911.8774884592. The cubic root of 620601640 is about 852.9776261330.

Adding to 620601640 its reverse (46106026), we get a palindrome (666707666).

The spelling of 620601640 in words is "six hundred twenty million, six hundred one thousand, six hundred forty".