1220659280 has 80 divisors (see below), whose sum is σ = 2894238864. Its totient is φ = 478679040.

The previous prime is 1220659277. The next prime is 1220659291. The reversal of 1220659280 is 829560221.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 155550784 + 1065108496 = 12472^2 + 32636^2 .

It is a tau number, because it is divible by the number of its divisors (80).

It is a self number, because there is not a number n which added to its sum of digits gives 1220659280.

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, 1149950 + ... + 1151010.

Almost surely, 2^1220659280 is an apocalyptic number.

1220659280 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 1220659280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1447119432).

1220659280 is an abundant number, since it is smaller than the sum of its proper divisors (1673579584).

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

1220659280 is a wasteful number, since it uses less digits than its factorization.

1220659280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1344 (or 1338 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 35.

The square root of 1220659280 is about 34937.9346842368. The cubic root of 1220659280 is about 1068.7221709749.

The spelling of 1220659280 in words is "one billion, two hundred twenty million, six hundred fifty-nine thousand, two hundred eighty".