1281272620 has 48 divisors (see below), whose sum is σ = 2724740928. Its totient is φ = 506050560.

The previous prime is 1281272611. The next prime is 1281272623. The reversal of 1281272620 is 262721821.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (1281272623) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 940740 + ... + 942100.

It is an arithmetic number, because the mean of its divisors is an integer number (56765436).

Almost surely, 2^1281272620 is an apocalyptic number.

1281272620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1281272620 is an abundant number, since it is smaller than the sum of its proper divisors (1443468308).

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

1281272620 is a wasteful number, since it uses less digits than its factorization.

1281272620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1930 (or 1928 counting only the distinct ones).

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

The square root of 1281272620 is about 35794.8686266621. The cubic root of 1281272620 is about 1086.1267630905.

The spelling of 1281272620 in words is "one billion, two hundred eighty-one million, two hundred seventy-two thousand, six hundred twenty".