1670706887 has 4 divisors (see below), whose sum is σ = 1673313936. Its totient is φ = 1668099840.

The previous prime is 1670706883. The next prime is 1670706889. The reversal of 1670706887 is 7886070761.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7886070761 = 1931 ⋅4083931.

It is a cyclic number.

It is not a de Polignac number, because 1670706887 - 2² = 1670706883 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 (1670706883) 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, 1302563 + ... + 1303844.

It is an arithmetic number, because the mean of its divisors is an integer number (418328484).

Almost surely, 2^1670706887 is an apocalyptic number.

1670706887 is a deficient number, since it is larger than the sum of its proper divisors (2607049).

1670706887 is an equidigital number, since it uses as much as digits as its factorization.

1670706887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2607048.

The product of its (nonzero) digits is 790272, while the sum is 50.

The square root of 1670706887 is about 40874.2814860396. The cubic root of 1670706887 is about 1186.5883705741.

The spelling of 1670706887 in words is "one billion, six hundred seventy million, seven hundred six thousand, eight hundred eighty-seven".