1243520680 has 32 divisors (see below), whose sum is σ = 2813396040. Its totient is φ = 494657280.

The previous prime is 1243520671. The next prime is 1243520687. The reversal of 1243520680 is 860253421.

It can be written as a sum of positive squares in 4 ways, for example, as 1001469316 + 242051364 = 31646^2 + 15558^2 .

It is not an unprimeable number, because it can be changed into a prime (1243520687) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 78639 + ... + 93118.

Almost surely, 2^1243520680 is an apocalyptic number.

1243520680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1243520680 is an abundant number, since it is smaller than the sum of its proper divisors (1569875360).

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

1243520680 is a wasteful number, since it uses less digits than its factorization.

1243520680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171949 (or 171945 counting only the distinct ones).

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

The square root of 1243520680 is about 35263.5885865293. The cubic root of 1243520680 is about 1075.3528836076.

The spelling of 1243520680 in words is "one billion, two hundred forty-three million, five hundred twenty thousand, six hundred eighty".