1218032640 has 528 divisors, whose sum is σ = 4828299840. Its totient is φ = 291962880.

The previous prime is 1218032611. The next prime is 1218032653. The reversal of 1218032640 is 462308121.

1218032640 is a `hidden beast` number, since 1 + 2 + 18 + 0 + 3 + 2 + 640 = 666.

It is a tau number, because it is divible by the number of its divisors (528).

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 47 ways as a sum of consecutive naturals, for example, 13685716 + ... + 13685804.

Almost surely, 2^1218032640 is an apocalyptic number.

1218032640 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 1218032640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2414149920).

1218032640 is an abundant number, since it is smaller than the sum of its proper divisors (3610267200).

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

1218032640 is an equidigital number, since it uses as much as digits as its factorization.

1218032640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140 (or 110 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 1218032640 is about 34900.3243537936. The cubic root of 1218032640 is about 1067.9550542883.

The spelling of 1218032640 in words is "one billion, two hundred eighteen million, thirty-two thousand, six hundred forty".