661367232 has 84 divisors (see below), whose sum is σ = 1910827776. Its totient is φ = 218695680.

The previous prime is 661367171. The next prime is 661367233. The reversal of 661367232 is 232763166.

661367232 is a `hidden beast` number, since 6 + 61 + 367 + 232 = 666.

661367232 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 (661367233) 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, 68632 + ... + 77672.

Almost surely, 2^661367232 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 661367232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (955413888).

661367232 is an abundant number, since it is smaller than the sum of its proper divisors (1249460544).

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

661367232 is a wasteful number, since it uses less digits than its factorization.

661367232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9186 (or 9173 counting only the distinct ones).

The product of its digits is 54432, while the sum is 36.

The square root of 661367232 is about 25717.0611073661. The cubic root of 661367232 is about 871.2595627960.

The spelling of 661367232 in words is "six hundred sixty-one million, three hundred sixty-seven thousand, two hundred thirty-two".