1244721648 has 80 divisors (see below), whose sum is σ = 3258541440. Its totient is φ = 409398528.

The previous prime is 1244721631. The next prime is 1244721671. The reversal of 1244721648 is 8461274421.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1313911 + ... + 1314857.

It is an arithmetic number, because the mean of its divisors is an integer number (40731768).

Almost surely, 2^1244721648 is an apocalyptic number.

It is an amenable number.

1244721648 is an abundant number, since it is smaller than the sum of its proper divisors (2013819792).

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

1244721648 is a wasteful number, since it uses less digits than its factorization.

1244721648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1294 (or 1288 counting only the distinct ones).

The product of its digits is 86016, while the sum is 39.

The square root of 1244721648 is about 35280.6129198459. The cubic root of 1244721648 is about 1075.6989571627.

The spelling of 1244721648 in words is "one billion, two hundred forty-four million, seven hundred twenty-one thousand, six hundred forty-eight".