1678943904 has 96 divisors (see below), whose sum is σ = 4819953600. Its totient is φ = 507494400.

The previous prime is 1678943897. The next prime is 1678943909. The reversal of 1678943904 is 4093498761.

It is a tau number, because it is divible by the number of its divisors (96).

It is a super-2 number, since 2×1678943904² = 5637705265557522432, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1678943909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 472374 + ... + 475914.

It is an arithmetic number, because the mean of its divisors is an integer number (50207850).

Almost surely, 2^1678943904 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 1678943904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2409976800).

1678943904 is an abundant number, since it is smaller than the sum of its proper divisors (3141009696).

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

1678943904 is a wasteful number, since it uses less digits than its factorization.

1678943904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4014 (or 4006 counting only the distinct ones).

The product of its (nonzero) digits is 1306368, while the sum is 51.

The square root of 1678943904 is about 40974.9179864951. The cubic root of 1678943904 is about 1188.5352370593.

The spelling of 1678943904 in words is "one billion, six hundred seventy-eight million, nine hundred forty-three thousand, nine hundred four".