620782820 has 144 divisors (see below), whose sum is σ = 1603784448. Its totient is φ = 197648640.

The previous prime is 620782819. The next prime is 620782823. The reversal of 620782820 is 28287026.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is not an unprimeable number, because it can be changed into a prime (620782823) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3588254 + ... + 3588426.

It is an arithmetic number, because the mean of its divisors is an integer number (11137392).

Almost surely, 2^620782820 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 620782820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (801892224).

620782820 is an abundant number, since it is smaller than the sum of its proper divisors (983001628).

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

620782820 is a wasteful number, since it uses less digits than its factorization.

620782820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 298 (or 277 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 35.

The square root of 620782820 is about 24915.5136411032. The cubic root of 620782820 is about 853.0606248661.

The spelling of 620782820 in words is "six hundred twenty million, seven hundred eighty-two thousand, eight hundred twenty".