1213664532 has 24 divisors (see below), whose sum is σ = 2874152736. Its totient is φ = 398516448.

The previous prime is 1213664521. The next prime is 1213664579. The reversal of 1213664532 is 2354663121.

It is a junction number, because it is equal to n+sod(n) for n = 1213664493 and 1213664502.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 753963 + ... + 755570.

It is an arithmetic number, because the mean of its divisors is an integer number (119756364).

Almost surely, 2^1213664532 is an apocalyptic number.

1213664532 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1213664532 is an abundant number, since it is smaller than the sum of its proper divisors (1660488204).

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

1213664532 is a wasteful number, since it uses less digits than its factorization.

1213664532 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1509607 (or 1509605 counting only the distinct ones).

The product of its digits is 25920, while the sum is 33.

The square root of 1213664532 is about 34837.6883848513. The cubic root of 1213664532 is about 1066.6768918725.

The spelling of 1213664532 in words is "one billion, two hundred thirteen million, six hundred sixty-four thousand, five hundred thirty-two".