1281371680 has 24 divisors (see below), whose sum is σ = 3027240972. Its totient is φ = 512548608.

The previous prime is 1281371657. The next prime is 1281371681. The reversal of 1281371680 is 861731821.

It can be written as a sum of positive squares in 2 ways, for example, as 1083463056 + 197908624 = 32916^2 + 14068^2 .

It is not an unprimeable number, because it can be changed into a prime (1281371681) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4004127 + ... + 4004446.

Almost surely, 2^1281371680 is an apocalyptic number.

1281371680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1281371680 is an abundant number, since it is smaller than the sum of its proper divisors (1745869292).

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

1281371680 is an equidigital number, since it uses as much as digits as its factorization.

1281371680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8008588 (or 8008580 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 37.

The square root of 1281371680 is about 35796.2523178056. The cubic root of 1281371680 is about 1086.1547532160.

The spelling of 1281371680 in words is "one billion, two hundred eighty-one million, three hundred seventy-one thousand, six hundred eighty".