1221560464 has 40 divisors (see below), whose sum is σ = 2498466080. Its totient is φ = 578581920.

The previous prime is 1221560423. The next prime is 1221560477. The reversal of 1221560464 is 4640651221.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 104179 + ... + 115309.

It is an arithmetic number, because the mean of its divisors is an integer number (62461652).

Almost surely, 2^1221560464 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1221560464, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1249233040).

1221560464 is an abundant number, since it is smaller than the sum of its proper divisors (1276905616).

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

1221560464 is an equidigital number, since it uses as much as digits as its factorization.

1221560464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11196 (or 11152 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 31.

The square root of 1221560464 is about 34950.8292319367. The cubic root of 1221560464 is about 1068.9851104150.

The spelling of 1221560464 in words is "one billion, two hundred twenty-one million, five hundred sixty thousand, four hundred sixty-four".