620449830 has 384 divisors, whose sum is σ = 2219083776. Its totient is φ = 116121600.

The previous prime is 620449829. The next prime is 620449877. The reversal of 620449830 is 38944026.

It is a happy number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 6396342 + ... + 6396438.

It is an arithmetic number, because the mean of its divisors is an integer number (5778864).

Almost surely, 2^620449830 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 620449830, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1109541888).

620449830 is an abundant number, since it is smaller than the sum of its proper divisors (1598633946).

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

620449830 is a wasteful number, since it uses less digits than its factorization.

620449830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 212 (or 209 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 36.

The square root of 620449830 is about 24908.8303619419. The cubic root of 620449830 is about 852.9080693862.

The spelling of 620449830 in words is "six hundred twenty million, four hundred forty-nine thousand, eight hundred thirty".