612345216 has 128 divisors (see below), whose sum is σ = 1872034560. Its totient is φ = 173721600.

The previous prime is 612345211. The next prime is 612345229. The reversal of 612345216 is 612543216.

It is a tau number, because it is divible by the number of its divisors (128).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (612345211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 421291 + ... + 422741.

It is an arithmetic number, because the mean of its divisors is an integer number (14625270).

Almost surely, 2^612345216 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 612345216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (936017280).

612345216 is an abundant number, since it is smaller than the sum of its proper divisors (1259689344).

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

612345216 is a wasteful number, since it uses less digits than its factorization.

612345216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1632 (or 1620 counting only the distinct ones).

The product of its digits is 8640, while the sum is 30.

The square root of 612345216 is about 24745.6100349133. The cubic root of 612345216 is about 849.1780825407.

The spelling of 612345216 in words is "six hundred twelve million, three hundred forty-five thousand, two hundred sixteen".