1213947648 has 90 divisors (see below), whose sum is σ = 3619834064. Its totient is φ = 404642304.

The previous prime is 1213947643. The next prime is 1213947653. The reversal of 1213947648 is 8467493121.

1213947648 is a `hidden beast` number, since 1 + 2 + 139 + 476 + 48 = 666.

It is an interprime number because it is at equal distance from previous prime (1213947643) and next prime (1213947653).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213947643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 8536 + ... + 50007.

Almost surely, 2^1213947648 is an apocalyptic number.

1213947648 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1213947648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1809917032).

1213947648 is an abundant number, since it is smaller than the sum of its proper divisors (2405886416).

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

1213947648 is an frugal number, since it uses more digits than its factorization.

1213947648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58571 (or 58548 counting only the distinct ones).

The product of its digits is 290304, while the sum is 45.

The square root of 1213947648 is about 34841.7515059160. The cubic root of 1213947648 is about 1066.7598279743.

The spelling of 1213947648 in words is "one billion, two hundred thirteen million, nine hundred forty-seven thousand, six hundred forty-eight".