1224720016 has 45 divisors (see below), whose sum is σ = 2573289819. Its totient is φ = 564415488.

The previous prime is 1224719999. The next prime is 1224720019. The reversal of 1224720016 is 6100274221.

The square root of 1224720016 is 34996.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 353289616 + 871430400 = 18796^2 + 29520^2 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1224720019) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1819456 + ... + 1820128.

Almost surely, 2^1224720016 is an apocalyptic number.

1224720016 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

1224720016 is the 34996-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1224720016

1224720016 is an abundant number, since it is smaller than the sum of its proper divisors (1348569803).

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

1224720016 is an frugal number, since it uses more digits than its factorization.

1224720016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1380 (or 688 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 25.

The cubic root of 1224720016 is about 1069.9059561565.

Multiplying 1224720016 by its sum of digits (25), we get a square (30618000400 = 174980²).

Adding to 1224720016 its reverse (6100274221), we get a palindrome (7324994237).

The spelling of 1224720016 in words is "one billion, two hundred twenty-four million, seven hundred twenty thousand, sixteen".