1281824272 has 20 divisors (see below), whose sum is σ = 2496020800. Its totient is φ = 637689888.

The previous prime is 1281824267. The next prime is 1281824317. The reversal of 1281824272 is 2724281821.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 198108 + ... + 204475.

It is an arithmetic number, because the mean of its divisors is an integer number (124801040).

Almost surely, 2^1281824272 is an apocalyptic number.

It is an amenable number.

1281824272 is a deficient number, since it is larger than the sum of its proper divisors (1214196528).

1281824272 is a wasteful number, since it uses less digits than its factorization.

1281824272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 402790 (or 402784 counting only the distinct ones).

The product of its digits is 28672, while the sum is 37.

The square root of 1281824272 is about 35802.5735387835. The cubic root of 1281824272 is about 1086.2826180382.

The spelling of 1281824272 in words is "one billion, two hundred eighty-one million, eight hundred twenty-four thousand, two hundred seventy-two".