1216064240 has 40 divisors (see below), whose sum is σ = 2855361888. Its totient is φ = 481606400.

The previous prime is 1216064233. The next prime is 1216064263. The reversal of 1216064240 is 424606121.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67172 + ... + 83331.

Almost surely, 2^1216064240 is an apocalyptic number.

1216064240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1216064240 is an abundant number, since it is smaller than the sum of its proper divisors (1639297648).

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

1216064240 is a wasteful number, since it uses less digits than its factorization.

1216064240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150617 (or 150611 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 1216064240 is about 34872.1126403320. The cubic root of 1216064240 is about 1067.3794550045.

The spelling of 1216064240 in words is "one billion, two hundred sixteen million, sixty-four thousand, two hundred forty".