612216990 has 288 divisors, whose sum is σ = 2086995456. Its totient is φ = 120954240.

The previous prime is 612216977. The next prime is 612216991. The reversal of 612216990 is 99612216.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (612216991) by changing a digit.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 3665887 + ... + 3666053.

It is an arithmetic number, because the mean of its divisors is an integer number (7246512).

Almost surely, 2^612216990 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 612216990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1043497728).

612216990 is an abundant number, since it is smaller than the sum of its proper divisors (1474778466).

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

612216990 is a wasteful number, since it uses less digits than its factorization.

612216990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 244 (or 218 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 36.

The square root of 612216990 is about 24743.0190154718. The cubic root of 612216990 is about 849.1188053513.

The spelling of 612216990 in words is "six hundred twelve million, two hundred sixteen thousand, nine hundred ninety".