1205720264 has 24 divisors (see below), whose sum is σ = 2629824390. Its totient is φ = 516737088.

The previous prime is 1205720207. The next prime is 1205720287. The reversal of 1205720264 is 4620275021.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1181296900 + 24423364 = 34370^2 + 4942^2 .

It is a super-2 number, since 2×1205720264² = 2907522710040459392, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1537517 + ... + 1538300.

Almost surely, 2^1205720264 is an apocalyptic number.

1205720264 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1205720264 is an abundant number, since it is smaller than the sum of its proper divisors (1424104126).

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

1205720264 is a wasteful number, since it uses less digits than its factorization.

1205720264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3075837 (or 3075826 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 29.

The square root of 1205720264 is about 34723.4828898254. The cubic root of 1205720264 is about 1064.3444175856.

Adding to 1205720264 its reverse (4620275021), we get a palindrome (5825995285).

The spelling of 1205720264 in words is "one billion, two hundred five million, seven hundred twenty thousand, two hundred sixty-four".