1220287680 has 196 divisors, whose sum is σ = 4357554912. Its totient is φ = 325347840.

The previous prime is 1220287631. The next prime is 1220287697. The reversal of 1220287680 is 867820221.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 230665 + ... + 235895.

Almost surely, 2^1220287680 is an apocalyptic number.

1220287680 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 1220287680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2178777456).

1220287680 is an abundant number, since it is smaller than the sum of its proper divisors (3137267232).

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

1220287680 is an frugal number, since it uses more digits than its factorization.

1220287680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5266 (or 5241 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 36.

The square root of 1220287680 is about 34932.6162776280. The cubic root of 1220287680 is about 1068.6137111528.

The spelling of 1220287680 in words is "one billion, two hundred twenty million, two hundred eighty-seven thousand, six hundred eighty".