1216650240 has 352 divisors, whose sum is σ = 4663229760. Its totient is φ = 299040768.

The previous prime is 1216650223. The next prime is 1216650301. The reversal of 1216650240 is 420566121.

1216650240 is a `hidden beast` number, since 1 + 2 + 1 + 6 + 650 + 2 + 4 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

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, 1796782 + ... + 1797458.

Almost surely, 2^1216650240 is an apocalyptic number.

1216650240 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 1216650240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2331614880).

1216650240 is an abundant number, since it is smaller than the sum of its proper divisors (3446579520).

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

1216650240 is a wasteful number, since it uses less digits than its factorization.

1216650240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 724 (or 700 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 1216650240 is about 34880.5137576842. The cubic root of 1216650240 is about 1067.5508779433.

The spelling of 1216650240 in words is "one billion, two hundred sixteen million, six hundred fifty thousand, two hundred forty".