1679920787 has 16 divisors (see below), whose sum is σ = 1765176000. Its totient is φ = 1596672000.

The previous prime is 1679920769. The next prime is 1679920793. The reversal of 1679920787 is 7870299761.

It is a cyclic number.

It is not a de Polignac number, because 1679920787 - 2⁸ = 1679920531 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1679920727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 558287 + ... + 561287.

It is an arithmetic number, because the mean of its divisors is an integer number (110323500).

Almost surely, 2^1679920787 is an apocalyptic number.

1679920787 is a deficient number, since it is larger than the sum of its proper divisors (85255213).

1679920787 is a wasteful number, since it uses less digits than its factorization.

1679920787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3326.

The product of its (nonzero) digits is 2667168, while the sum is 56.

The square root of 1679920787 is about 40986.8367527917. The cubic root of 1679920787 is about 1188.7657062951.

The spelling of 1679920787 in words is "one billion, six hundred seventy-nine million, nine hundred twenty thousand, seven hundred eighty-seven".