1217739648 has 96 divisors (see below), whose sum is σ = 3436398360. Its totient is φ = 382001152.

The previous prime is 1217739643. The next prime is 1217739683. The reversal of 1217739648 is 8469377121.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (96).

It is a super-2 number, since 2×1217739648² = 2965779700622327808, which contains 22 as substring.

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 = 1217739597 and 1217739606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1217739643) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 105490 + ... + 116462.

Almost surely, 2^1217739648 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 1217739648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1718199180).

1217739648 is an abundant number, since it is smaller than the sum of its proper divisors (2218658712).

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

1217739648 is a wasteful number, since it uses less digits than its factorization.

1217739648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11024 (or 10995 counting only the distinct ones).

The product of its digits is 508032, while the sum is 48.

The square root of 1217739648 is about 34896.1265472258. The cubic root of 1217739648 is about 1067.8694169062.

The spelling of 1217739648 in words is "one billion, two hundred seventeen million, seven hundred thirty-nine thousand, six hundred forty-eight".