661862 has 16 divisors (see below), whose sum is σ = 1036800. Its totient is φ = 316680.

The previous prime is 661849. The next prime is 661873. The reversal of 661862 is 268166.

It is a super-2 number, since 2×661862² = 876122614088, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

661862 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8339 + ... + 8417.

It is an arithmetic number, because the mean of its divisors is an integer number (64800).

2⁶⁶¹⁸⁶² is an apocalyptic number.

661862 is a deficient number, since it is larger than the sum of its proper divisors (374938).

661862 is a wasteful number, since it uses less digits than its factorization.

661862 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211.

The product of its digits is 3456, while the sum is 29.

The square root of 661862 is about 813.5490151183. The cubic root of 661862 is about 87.1476771371.

The spelling of 661862 in words is "six hundred sixty-one thousand, eight hundred sixty-two".