661382 has 8 divisors (see below), whose sum is σ = 995976. Its totient is φ = 329392.

The previous prime is 661373. The next prime is 661393. The reversal of 661382 is 283166.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×661382² = 874852299848, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 218 + ... + 1170.

It is an arithmetic number, because the mean of its divisors is an integer number (124497).

2⁶⁶¹³⁸² is an apocalyptic number.

661382 is a deficient number, since it is larger than the sum of its proper divisors (334594).

661382 is a wasteful number, since it uses less digits than its factorization.

661382 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1302.

The product of its digits is 1728, while the sum is 26.

The square root of 661382 is about 813.2539578754. The cubic root of 661382 is about 87.1266047678.

The spelling of 661382 in words is "six hundred sixty-one thousand, three hundred eighty-two".