1678404312 has 96 divisors (see below), whose sum is σ = 4922888880. Its totient is φ = 513527040.

The previous prime is 1678404293. The next prime is 1678404313. The reversal of 1678404312 is 2134048761.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1678404313) 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 23 ways as a sum of consecutive naturals, for example, 164463 + ... + 174369.

Almost surely, 2^1678404312 is an apocalyptic number.

1678404312 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1678404312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2461444440).

1678404312 is an abundant number, since it is smaller than the sum of its proper divisors (3244484568).

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

1678404312 is a wasteful number, since it uses less digits than its factorization.

1678404312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10113 (or 10106 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 36.

The square root of 1678404312 is about 40968.3330390681. Note that the first 3 decimals coincide. The cubic root of 1678404312 is about 1188.4078965287.

The spelling of 1678404312 in words is "one billion, six hundred seventy-eight million, four hundred four thousand, three hundred twelve".