1678731612 has 12 divisors (see below), whose sum is σ = 3917040456. Its totient is φ = 559577200.

The previous prime is 1678731583. The next prime is 1678731673. The reversal of 1678731612 is 2161378761.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 69947139 + ... + 69947162.

It is an arithmetic number, because the mean of its divisors is an integer number (326420038).

Almost surely, 2^1678731612 is an apocalyptic number.

1678731612 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1678731612 is an abundant number, since it is smaller than the sum of its proper divisors (2238308844).

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

1678731612 is a wasteful number, since it uses less digits than its factorization.

1678731612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139894308 (or 139894306 counting only the distinct ones).

The product of its digits is 84672, while the sum is 42.

The square root of 1678731612 is about 40972.3273930100. The cubic root of 1678731612 is about 1188.4851406550.

The spelling of 1678731612 in words is "one billion, six hundred seventy-eight million, seven hundred thirty-one thousand, six hundred twelve".