1678945728 has 56 divisors (see below), whose sum is σ = 4454501632. Its totient is φ = 558100224.

The previous prime is 1678945727. The next prime is 1678945729. The reversal of 1678945728 is 8275498761.

It is an interprime number because it is at equal distance from previous prime (1678945727) and next prime (1678945729).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1678945727) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58551 + ... + 82377.

It is an arithmetic number, because the mean of its divisors is an integer number (79544672).

Almost surely, 2^1678945728 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1678945728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2227250816).

1678945728 is an abundant number, since it is smaller than the sum of its proper divisors (2775555904).

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

1678945728 is a wasteful number, since it uses less digits than its factorization.

1678945728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24209 (or 24199 counting only the distinct ones).

The product of its digits is 6773760, while the sum is 57.

The square root of 1678945728 is about 40974.9402440077. The cubic root of 1678945728 is about 1188.5356674662.

The spelling of 1678945728 in words is "one billion, six hundred seventy-eight million, nine hundred forty-five thousand, seven hundred twenty-eight".