1216698620 has 48 divisors (see below), whose sum is σ = 2681743680. Its totient is φ = 462798336.

The previous prime is 1216698601. The next prime is 1216698647. The reversal of 1216698620 is 268966121.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 71936 + ... + 87224.

It is an arithmetic number, because the mean of its divisors is an integer number (55869660).

Almost surely, 2^1216698620 is an apocalyptic number.

1216698620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1216698620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1340871840).

1216698620 is an abundant number, since it is smaller than the sum of its proper divisors (1465045060).

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

1216698620 is a wasteful number, since it uses less digits than its factorization.

1216698620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15494 (or 15492 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 41.

The square root of 1216698620 is about 34881.2072612173. The cubic root of 1216698620 is about 1067.5650281144.

The spelling of 1216698620 in words is "one billion, two hundred sixteen million, six hundred ninety-eight thousand, six hundred twenty".