620512640 has 128 divisors (see below), whose sum is σ = 1703808000. Its totient is φ = 213719040.

The previous prime is 620512639. The next prime is 620512643. The reversal of 620512640 is 46215026.

It is a tau number, because it is divible by the number of its divisors (128).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (620512643) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 131441 + ... + 136079.

It is an arithmetic number, because the mean of its divisors is an integer number (13311000).

Almost surely, 2^620512640 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 620512640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (851904000).

620512640 is an abundant number, since it is smaller than the sum of its proper divisors (1083295360).

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

620512640 is a wasteful number, since it uses less digits than its factorization.

620512640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4688 (or 4676 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 620512640 is about 24910.0911278943. The cubic root of 620512640 is about 852.9368492303.

Adding to 620512640 its reverse (46215026), we get a palindrome (666727666).

The spelling of 620512640 in words is "six hundred twenty million, five hundred twelve thousand, six hundred forty".