1213847680 has 64 divisors (see below), whose sum is σ = 3054614400. Its totient is φ = 459979776.

The previous prime is 1213847671. The next prime is 1213847707. The reversal of 1213847680 is 867483121.

It is a tau number, because it is divible by the number of its divisors (64).

It is a Harshad number since it is a multiple of its sum of digits (40).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37752 + ... + 62071.

It is an arithmetic number, because the mean of its divisors is an integer number (47728350).

Almost surely, 2^1213847680 is an apocalyptic number.

1213847680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1213847680 is an abundant number, since it is smaller than the sum of its proper divisors (1840766720).

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

1213847680 is an equidigital number, since it uses as much as digits as its factorization.

1213847680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99861 (or 99849 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 40.

The square root of 1213847680 is about 34840.3168757117. The cubic root of 1213847680 is about 1066.7305447856.

The spelling of 1213847680 in words is "one billion, two hundred thirteen million, eight hundred forty-seven thousand, six hundred eighty".