1216570752 has 96 divisors (see below), whose sum is σ = 3630561480. Its totient is φ = 405513216.

The previous prime is 1216570739. The next prime is 1216570759. The reversal of 1216570752 is 2570756121.

1216570752 is a `hidden beast` number, since 1 + 2 + 16 + 570 + 75 + 2 = 666.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216570759) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11548 + ... + 50660.

Almost surely, 2^1216570752 is an apocalyptic number.

1216570752 is a gapful number since it is divisible by the number (12) 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 1216570752, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1815280740).

1216570752 is an abundant number, since it is smaller than the sum of its proper divisors (2413990728).

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

1216570752 is an frugal number, since it uses more digits than its factorization.

1216570752 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39142 (or 39118 counting only the distinct ones).

The product of its (nonzero) digits is 29400, while the sum is 36.

The square root of 1216570752 is about 34879.3743063146. The cubic root of 1216570752 is about 1067.5276284973.

The spelling of 1216570752 in words is "one billion, two hundred sixteen million, five hundred seventy thousand, seven hundred fifty-two".