1211748864 has 80 divisors (see below), whose sum is σ = 3398160480. Its totient is φ = 382648320.

The previous prime is 1211748793. The next prime is 1211748869. The reversal of 1211748864 is 4688471121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211748869) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8424 + ... + 49944.

It is an arithmetic number, because the mean of its divisors is an integer number (42477006).

Almost surely, 2^1211748864 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 1211748864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1699080240).

1211748864 is an abundant number, since it is smaller than the sum of its proper divisors (2186411616).

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

1211748864 is an equidigital number, since it uses as much as digits as its factorization.

1211748864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41561 (or 41545 counting only the distinct ones).

The product of its digits is 86016, while the sum is 42.

The square root of 1211748864 is about 34810.1833376384. The cubic root of 1211748864 is about 1066.1153762341.

The spelling of 1211748864 in words is "one billion, two hundred eleven million, seven hundred forty-eight thousand, eight hundred sixty-four".