660457287 has 16 divisors (see below), whose sum is σ = 1118234880. Its totient is φ = 377404056.

The previous prime is 660457283. The next prime is 660457307. The reversal of 660457287 is 782754066.

It is not a de Polignac number, because 660457287 - 2² = 660457283 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660457283) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1747053 + ... + 1747430.

It is an arithmetic number, because the mean of its divisors is an integer number (69889680).

Almost surely, 2^660457287 is an apocalyptic number.

660457287 is a deficient number, since it is larger than the sum of its proper divisors (457777593).

660457287 is a wasteful number, since it uses less digits than its factorization.

660457287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3494499 (or 3494493 counting only the distinct ones).

The product of its (nonzero) digits is 564480, while the sum is 45.

The square root of 660457287 is about 25699.3635524306. The cubic root of 660457287 is about 870.8598039760.

The spelling of 660457287 in words is "six hundred sixty million, four hundred fifty-seven thousand, two hundred eighty-seven".