1630728678 has 16 divisors (see below), whose sum is σ = 3310136640. Its totient is φ = 535463016.

The previous prime is 1630728569. The next prime is 1630728691. The reversal of 1630728678 is 8768270361.

1630728678 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2027868 + ... + 2028671.

It is an arithmetic number, because the mean of its divisors is an integer number (206883540).

Almost surely, 2^1630728678 is an apocalyptic number.

1630728678 is an abundant number, since it is smaller than the sum of its proper divisors (1679407962).

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

1630728678 is a wasteful number, since it uses less digits than its factorization.

1630728678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4056611.

The product of its (nonzero) digits is 677376, while the sum is 48.

The square root of 1630728678 is about 40382.2817334533. The cubic root of 1630728678 is about 1177.0472660553.

The spelling of 1630728678 in words is "one billion, six hundred thirty million, seven hundred twenty-eight thousand, six hundred seventy-eight".