612943656 has 128 divisors (see below), whose sum is σ = 1720320000. Its totient is φ = 180714240.

The previous prime is 612943651. The next prime is 612943663. The reversal of 612943656 is 656349216.

It is an alternating number because its digits alternate between even and odd.

It is not an unprimeable number, because it can be changed into a prime (612943651) 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 31 ways as a sum of consecutive naturals, for example, 1228095 + ... + 1228593.

It is an arithmetic number, because the mean of its divisors is an integer number (13440000).

Almost surely, 2^612943656 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 612943656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (860160000).

612943656 is an abundant number, since it is smaller than the sum of its proper divisors (1107376344).

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

612943656 is a wasteful number, since it uses less digits than its factorization.

612943656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 679 (or 675 counting only the distinct ones).

The product of its digits is 233280, while the sum is 42.

The square root of 612943656 is about 24757.6989237691. The cubic root of 612943656 is about 849.4546240845.

The spelling of 612943656 in words is "six hundred twelve million, nine hundred forty-three thousand, six hundred fifty-six".