620280640 has 112 divisors (see below), whose sum is σ = 1713658752. Its totient is φ = 209442816.

The previous prime is 620280613. The next prime is 620280641. The reversal of 620280640 is 46082026.

It is a tau number, because it is divible by the number of its divisors (112).

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a junction number, because it is equal to n+sod(n) for n = 620280599 and 620280608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (620280641) 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, 148014 + ... + 152146.

Almost surely, 2^620280640 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 620280640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (856829376).

620280640 is an abundant number, since it is smaller than the sum of its proper divisors (1093378112).

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

620280640 is a wasteful number, since it uses less digits than its factorization.

620280640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4224 (or 4214 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 28.

The square root of 620280640 is about 24905.4339452257. The cubic root of 620280640 is about 852.8305360505.

The spelling of 620280640 in words is "six hundred twenty million, two hundred eighty thousand, six hundred forty".