487309657 has 4 divisors (see below), whose sum is σ = 487426356. Its totient is φ = 487192960.

The previous prime is 487309643. The next prime is 487309673. The reversal of 487309657 is 756903784.

It is a happy number.

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 19193161 + 468116496 = 4381^2 + 21636^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-487309657 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 487309657.

It is not an unprimeable number, because it can be changed into a prime (487309637) 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, 51844 + ... + 60517.

It is an arithmetic number, because the mean of its divisors is an integer number (121856589).

Almost surely, 2^487309657 is an apocalyptic number.

It is an amenable number.

487309657 is a deficient number, since it is larger than the sum of its proper divisors (116699).

487309657 is a wasteful number, since it uses less digits than its factorization.

487309657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116698.

The product of its (nonzero) digits is 1270080, while the sum is 49.

The square root of 487309657 is about 22075.0913248394. The cubic root of 487309657 is about 786.9280137073.

The spelling of 487309657 in words is "four hundred eighty-seven million, three hundred nine thousand, six hundred fifty-seven".