487057661 has 4 divisors (see below), whose sum is σ = 492078972. Its totient is φ = 482036352.

The previous prime is 487057631. The next prime is 487057693. The reversal of 487057661 is 166750784.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 221563225 + 265494436 = 14885^2 + 16294^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-487057661 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (487057601) 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, 2510510 + ... + 2510703.

It is an arithmetic number, because the mean of its divisors is an integer number (123019743).

Almost surely, 2^487057661 is an apocalyptic number.

It is an amenable number.

487057661 is a deficient number, since it is larger than the sum of its proper divisors (5021311).

487057661 is an equidigital number, since it uses as much as digits as its factorization.

487057661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5021310.

The product of its (nonzero) digits is 282240, while the sum is 44.

The square root of 487057661 is about 22069.3828867053. The cubic root of 487057661 is about 786.7923457594.

The spelling of 487057661 in words is "four hundred eighty-seven million, fifty-seven thousand, six hundred sixty-one".