661762 has 8 divisors (see below), whose sum is σ = 996300. Its totient is φ = 329664.

The previous prime is 661741. The next prime is 661769. The reversal of 661762 is 267166.

It can be written as a sum of positive squares in 2 ways, for example, as 531441 + 130321 = 729^2 + 361^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 661762.

It is not an unprimeable number, because it can be changed into a prime (661769) by changing a digit.

661762 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 3 ways as a sum of consecutive naturals, for example, 414 + ... + 1222.

2⁶⁶¹⁷⁶² is an apocalyptic number.

661762 is a deficient number, since it is larger than the sum of its proper divisors (334538).

661762 is a wasteful number, since it uses less digits than its factorization.

661762 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1220.

The product of its digits is 3024, while the sum is 28.

The square root of 661762 is about 813.4875536848. The cubic root of 661762 is about 87.1432879005.

The spelling of 661762 in words is "six hundred sixty-one thousand, seven hundred sixty-two".