1216652634 has 48 divisors (see below), whose sum is σ = 2813211648. Its totient is φ = 378677376.

The previous prime is 1216652579. The next prime is 1216652639. The reversal of 1216652634 is 4362566121.

1216652634 is a `hidden beast` number, since 1 + 2 + 16 + 6 + 5 + 2 + 634 = 666.

It is not an unprimeable number, because it can be changed into a prime (1216652639) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 23209 + ... + 54515.

It is an arithmetic number, because the mean of its divisors is an integer number (58608576).

Almost surely, 2^1216652634 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1216652634, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1406605824).

1216652634 is an abundant number, since it is smaller than the sum of its proper divisors (1596559014).

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

1216652634 is a wasteful number, since it uses less digits than its factorization.

1216652634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31459 (or 31456 counting only the distinct ones).

The product of its digits is 51840, while the sum is 36.

The square root of 1216652634 is about 34880.5480748224. The cubic root of 1216652634 is about 1067.5515781487.

The spelling of 1216652634 in words is "one billion, two hundred sixteen million, six hundred fifty-two thousand, six hundred thirty-four".