1677216678 has 16 divisors (see below), whose sum is σ = 3530982720. Its totient is φ = 529647336.

The previous prime is 1677216637. The next prime is 1677216691. The reversal of 1677216678 is 8766127761.

It is a super-2 number, since 2×1677216678² = 5626111569922711368, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1677216678.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 7356100 + ... + 7356327.

It is an arithmetic number, because the mean of its divisors is an integer number (220686420).

Almost surely, 2^1677216678 is an apocalyptic number.

1677216678 is an abundant number, since it is smaller than the sum of its proper divisors (1853766042).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1677216678 is a wasteful number, since it uses less digits than its factorization.

1677216678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14712451.

The product of its digits is 1185408, while the sum is 51.

The square root of 1677216678 is about 40953.8359375529. The cubic root of 1677216678 is about 1188.1275257337.

The spelling of 1677216678 in words is "one billion, six hundred seventy-seven million, two hundred sixteen thousand, six hundred seventy-eight".