1216928832 has 56 divisors (see below), whose sum is σ = 3679765056. Its totient is φ = 347693568.

The previous prime is 1216928809. The next prime is 1216928837. The reversal of 1216928832 is 2388296121.

It is a tau number, because it is divible by the number of its divisors (56).

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (1216928837) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 451383 + ... + 454070.

Almost surely, 2^1216928832 is an apocalyptic number.

1216928832 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1216928832 is an abundant number, since it is smaller than the sum of its proper divisors (2462836224).

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

1216928832 is an equidigital number, since it uses as much as digits as its factorization.

1216928832 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 905475 (or 905465 counting only the distinct ones).

The product of its digits is 82944, while the sum is 42.

The square root of 1216928832 is about 34884.5070482585. The cubic root of 1216928832 is about 1067.6323553273.

The spelling of 1216928832 in words is "one billion, two hundred sixteen million, nine hundred twenty-eight thousand, eight hundred thirty-two".