1678992987 has 12 divisors (see below), whose sum is σ = 2604152616. Its totient is φ = 959424480.

The previous prime is 1678992983. The next prime is 1678993013. The reversal of 1678992987 is 7892998761.

It is not a de Polignac number, because 1678992987 - 2² = 1678992983 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1678992983) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5710714 + ... + 5711007.

It is an arithmetic number, because the mean of its divisors is an integer number (217012718).

Almost surely, 2^1678992987 is an apocalyptic number.

1678992987 is a deficient number, since it is larger than the sum of its proper divisors (925159629).

1678992987 is a wasteful number, since it uses less digits than its factorization.

1678992987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11421738 (or 11421731 counting only the distinct ones).

The product of its digits is 27433728, while the sum is 66.

The square root of 1678992987 is about 40975.5169216936. The cubic root of 1678992987 is about 1188.5468190040.

The spelling of 1678992987 in words is "one billion, six hundred seventy-eight million, nine hundred ninety-two thousand, nine hundred eighty-seven".