1243677648 has 80 divisors (see below), whose sum is σ = 3349874880. Its totient is φ = 397243392.

The previous prime is 1243677629. The next prime is 1243677649. The reversal of 1243677648 is 8467763421.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a junction number, because it is equal to n+sod(n) for n = 1243677597 and 1243677606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1243677649) 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, 103708 + ... + 115076.

It is an arithmetic number, because the mean of its divisors is an integer number (41873436).

Almost surely, 2^1243677648 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1243677648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1674937440).

1243677648 is an abundant number, since it is smaller than the sum of its proper divisors (2106197232).

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

1243677648 is a wasteful number, since it uses less digits than its factorization.

1243677648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11476 (or 11470 counting only the distinct ones).

The product of its digits is 1354752, while the sum is 48.

The square root of 1243677648 is about 35265.8141547874. The cubic root of 1243677648 is about 1075.3981285031.

The spelling of 1243677648 in words is "one billion, two hundred forty-three million, six hundred seventy-seven thousand, six hundred forty-eight".