619974656 has 78 divisors (see below), whose sum is σ = 1442680830. Its totient is φ = 265617408.

The previous prime is 619974647. The next prime is 619974703. The reversal of 619974656 is 656479916.

It can be written as a sum of positive squares in only one way, i.e., 607129600 + 12845056 = 24640^2 + 3584^2 .

It is a junction number, because it is equal to n+sod(n) for n = 619974598 and 619974607.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 199160 + ... + 202248.

Almost surely, 2^619974656 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 619974656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (721340415).

619974656 is an abundant number, since it is smaller than the sum of its proper divisors (822706174).

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

619974656 is an equidigital number, since it uses as much as digits as its factorization.

619974656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3127 (or 3098 counting only the distinct ones).

The product of its digits is 2449440, while the sum is 53.

The square root of 619974656 is about 24899.2902710097. The cubic root of 619974656 is about 852.6902794188.

The spelling of 619974656 in words is "six hundred nineteen million, nine hundred seventy-four thousand, six hundred fifty-six".