1216331760 has 80 divisors (see below), whose sum is σ = 4309295616. Its totient is φ = 278018304.

The previous prime is 1216331749. The next prime is 1216331771. The reversal of 1216331760 is 671336121.

It is an interprime number because it is at equal distance from previous prime (1216331749) and next prime (1216331771).

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 360324 + ... + 363683.

Almost surely, 2^1216331760 is an apocalyptic number.

1216331760 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1216331760 is an abundant number, since it is smaller than the sum of its proper divisors (3092963856).

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

1216331760 is a wasteful number, since it uses less digits than its factorization.

1216331760 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 724030 (or 724024 counting only the distinct ones).

The product of its (nonzero) digits is 4536, while the sum is 30.

The square root of 1216331760 is about 34875.9481591540. The cubic root of 1216331760 is about 1067.4577196241.

Adding to 1216331760 its reverse (671336121), we get a palindrome (1887667881).

The spelling of 1216331760 in words is "one billion, two hundred sixteen million, three hundred thirty-one thousand, seven hundred sixty".