1247120680 has 128 divisors (see below), whose sum is σ = 3246324480. Its totient is φ = 427069440.

The previous prime is 1247120671. The next prime is 1247120681. The reversal of 1247120680 is 860217421.

It is not an unprimeable number, because it can be changed into a prime (1247120681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 626647 + ... + 628633.

It is an arithmetic number, because the mean of its divisors is an integer number (25361910).

Almost surely, 2^1247120680 is an apocalyptic number.

1247120680 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 1247120680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1623162240).

1247120680 is an abundant number, since it is smaller than the sum of its proper divisors (1999203800).

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

1247120680 is a wasteful number, since it uses less digits than its factorization.

1247120680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2099 (or 2095 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 31.

The square root of 1247120680 is about 35314.5958493085. The cubic root of 1247120680 is about 1076.3896015478.

The spelling of 1247120680 in words is "one billion, two hundred forty-seven million, one hundred twenty thousand, six hundred eighty".