613920820 has 12 divisors (see below), whose sum is σ = 1289233764. Its totient is φ = 245568320.

The previous prime is 613920817. The next prime is 613920877. The reversal of 613920820 is 28029316.

It can be written as a sum of positive squares in 2 ways, for example, as 230857636 + 383063184 = 15194^2 + 19572^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15348001 + ... + 15348040.

It is an arithmetic number, because the mean of its divisors is an integer number (107436147).

Almost surely, 2^613920820 is an apocalyptic number.

It is an amenable number.

613920820 is an abundant number, since it is smaller than the sum of its proper divisors (675312944).

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

613920820 is a wasteful number, since it uses less digits than its factorization.

613920820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30696050 (or 30696048 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 613920820 is about 24777.4256128436. The cubic root of 613920820 is about 849.9057888663.

The spelling of 613920820 in words is "six hundred thirteen million, nine hundred twenty thousand, eight hundred twenty".