1670787997 has 16 divisors (see below), whose sum is σ = 1744699392. Its totient is φ = 1598229360.

The previous prime is 1670787967. The next prime is 1670788003. The reversal of 1670787997 is 7997870761.

It is a cyclic number.

It is not a de Polignac number, because 1670787997 - 2¹⁹ = 1670263709 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 (1670787917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1365528 + ... + 1366750.

It is an arithmetic number, because the mean of its divisors is an integer number (109043712).

Almost surely, 2^1670787997 is an apocalyptic number.

It is an amenable number.

1670787997 is a deficient number, since it is larger than the sum of its proper divisors (73911395).

1670787997 is a wasteful number, since it uses less digits than its factorization.

1670787997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1728.

The product of its (nonzero) digits is 9335088, while the sum is 61.

The square root of 1670787997 is about 40875.2736626925. The cubic root of 1670787997 is about 1186.6075725510.

The spelling of 1670787997 in words is "one billion, six hundred seventy million, seven hundred eighty-seven thousand, nine hundred ninety-seven".