1678607457 has 4 divisors (see below), whose sum is σ = 2238143280. Its totient is φ = 1119071636.

The previous prime is 1678607449. The next prime is 1678607461. The reversal of 1678607457 is 7547068761.

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 1678607457 - 2³ = 1678607449 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1678607417) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 279767907 + ... + 279767912.

It is an arithmetic number, because the mean of its divisors is an integer number (559535820).

Almost surely, 2^1678607457 is an apocalyptic number.

It is an amenable number.

1678607457 is a deficient number, since it is larger than the sum of its proper divisors (559535823).

1678607457 is an equidigital number, since it uses as much as digits as its factorization.

1678607457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 559535822.

The product of its (nonzero) digits is 1975680, while the sum is 51.

The square root of 1678607457 is about 40970.8122570202. The cubic root of 1678607457 is about 1188.4558407539.

The spelling of 1678607457 in words is "one billion, six hundred seventy-eight million, six hundred seven thousand, four hundred fifty-seven".