620781380 has 12 divisors (see below), whose sum is σ = 1303640940. Its totient is φ = 248312544.

The previous prime is 620781361. The next prime is 620781383. The reversal of 620781380 is 83187026.

It can be written as a sum of positive squares in 2 ways, for example, as 230007556 + 390773824 = 15166^2 + 19768^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 620781380.

It is not an unprimeable number, because it can be changed into a prime (620781383) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15519515 + ... + 15519554.

It is an arithmetic number, because the mean of its divisors is an integer number (108636745).

Almost surely, 2^620781380 is an apocalyptic number.

It is an amenable number.

620781380 is an abundant number, since it is smaller than the sum of its proper divisors (682859560).

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

620781380 is a wasteful number, since it uses less digits than its factorization.

620781380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31039078 (or 31039076 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 620781380 is about 24915.4847434281. The cubic root of 620781380 is about 853.0599652643.

The spelling of 620781380 in words is "six hundred twenty million, seven hundred eighty-one thousand, three hundred eighty".