661007732 has 48 divisors (see below), whose sum is σ = 1469446272. Its totient is φ = 252670080.

The previous prime is 661007713. The next prime is 661007749. The reversal of 661007732 is 237700166.

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, 3923 + ... + 36570.

It is an arithmetic number, because the mean of its divisors is an integer number (30613464).

Almost surely, 2^661007732 is an apocalyptic number.

It is an amenable number.

661007732 is an abundant number, since it is smaller than the sum of its proper divisors (808438540).

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

661007732 is a wasteful number, since it uses less digits than its factorization.

661007732 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40568 (or 40566 counting only the distinct ones).

The product of its (nonzero) digits is 10584, while the sum is 32.

The square root of 661007732 is about 25710.0706338975. The cubic root of 661007732 is about 871.1016703943.

Adding to 661007732 its reverse (237700166), we get a palindrome (898707898).

The spelling of 661007732 in words is "six hundred sixty-one million, seven thousand, seven hundred thirty-two".