1213787760 has 160 divisors (see below), whose sum is σ = 4050222912. Its totient is φ = 299581440.

The previous prime is 1213787749. The next prime is 1213787807. The reversal of 1213787760 is 677873121.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 246442 + ... + 251318.

Almost surely, 2^1213787760 is an apocalyptic number.

1213787760 is a gapful number since it is divisible by the number (10) 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 1213787760, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2025111456).

1213787760 is an abundant number, since it is smaller than the sum of its proper divisors (2836435152).

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

1213787760 is a wasteful number, since it uses less digits than its factorization.

1213787760 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4971 (or 4965 counting only the distinct ones).

The product of its (nonzero) digits is 98784, while the sum is 42.

The square root of 1213787760 is about 34839.4569418067. The cubic root of 1213787760 is about 1066.7129919117.

The spelling of 1213787760 in words is "one billion, two hundred thirteen million, seven hundred eighty-seven thousand, seven hundred sixty".