612989856 has 192 divisors, whose sum is σ = 1909353600. Its totient is φ = 193155840.

The previous prime is 612989843. The next prime is 612989863. The reversal of 612989856 is 658989216.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (54).

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

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 31 ways as a sum of consecutive naturals, for example, 1329466 + ... + 1329926.

It is an arithmetic number, because the mean of its divisors is an integer number (9944550).

Almost surely, 2^612989856 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 612989856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (954676800).

612989856 is an abundant number, since it is smaller than the sum of its proper divisors (1296363744).

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

612989856 is an equidigital number, since it uses as much as digits as its factorization.

612989856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 511 (or 485 counting only the distinct ones).

The product of its digits is 1866240, while the sum is 54.

The square root of 612989856 is about 24758.6319492819. The cubic root of 612989856 is about 849.4759658056.

The spelling of 612989856 in words is "six hundred twelve million, nine hundred eighty-nine thousand, eight hundred fifty-six".