1216422570 has 64 divisors (see below), whose sum is σ = 3192545664. Its totient is φ = 294174720.

The previous prime is 1216422569. The next prime is 1216422577. The reversal of 1216422570 is 752246121.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1216422577) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 138634 + ... + 147146.

It is an arithmetic number, because the mean of its divisors is an integer number (49883526).

Almost surely, 2^1216422570 is an apocalyptic number.

1216422570 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1216422570, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1596272832).

1216422570 is an abundant number, since it is smaller than the sum of its proper divisors (1976123094).

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

1216422570 is a wasteful number, since it uses less digits than its factorization.

1216422570 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8967.

The product of its (nonzero) digits is 6720, while the sum is 30.

The square root of 1216422570 is about 34877.2500349440. The cubic root of 1216422570 is about 1067.4842840386.

Adding to 1216422570 its reverse (752246121), we get a palindrome (1968668691).

The spelling of 1216422570 in words is "one billion, two hundred sixteen million, four hundred twenty-two thousand, five hundred seventy".