487661 has 4 divisors (see below), whose sum is σ = 503424. Its totient is φ = 471900.

The previous prime is 487657. The next prime is 487681. The reversal of 487661 is 166784.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 487661 - 2² = 487657 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 487661.

It is not an unprimeable number, because it can be changed into a prime (487601) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7835 + ... + 7896.

It is an arithmetic number, because the mean of its divisors is an integer number (125856).

2⁴⁸⁷⁶⁶¹ is an apocalyptic number.

It is an amenable number.

487661 is a deficient number, since it is larger than the sum of its proper divisors (15763).

487661 is a wasteful number, since it uses less digits than its factorization.

487661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15762.

The product of its digits is 8064, while the sum is 32.

The square root of 487661 is about 698.3272871656. The cubic root of 487661 is about 78.7117089398.

The spelling of 487661 in words is "four hundred eighty-seven thousand, six hundred sixty-one".