1216620460 has 48 divisors (see below), whose sum is σ = 2802657312. Its totient is φ = 439948800.

The previous prime is 1216620401. The next prime is 1216620479. The reversal of 1216620460 is 640266121.

It is a super-2 number, since 2×1216620460² = 2960330687381223200, which contains 22 as substring.

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, 24544 + ... + 55096.

It is an arithmetic number, because the mean of its divisors is an integer number (58388694).

Almost surely, 2^1216620460 is an apocalyptic number.

1216620460 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 1216620460, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1401328656).

1216620460 is an abundant number, since it is smaller than the sum of its proper divisors (1586036852).

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

1216620460 is a wasteful number, since it uses less digits than its factorization.

1216620460 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30754 (or 30752 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 1216620460 is about 34880.0868691579. The cubic root of 1216620460 is about 1067.5421677094.

Adding to 1216620460 its reverse (640266121), we get a palindrome (1856886581).

The spelling of 1216620460 in words is "one billion, two hundred sixteen million, six hundred twenty thousand, four hundred sixty".