1656378320 has 20 divisors (see below), whose sum is σ = 3851079780. Its totient is φ = 662551296.

The previous prime is 1656378259. The next prime is 1656378337. The reversal of 1656378320 is 238736561.

It can be written as a sum of positive squares in 2 ways, for example, as 835441216 + 820937104 = 28904^2 + 28652^2 .

It is a tau number, because it is divible by the number of its divisors (20).

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, 10352285 + ... + 10352444.

It is an arithmetic number, because the mean of its divisors is an integer number (192553989).

Almost surely, 2^1656378320 is an apocalyptic number.

1656378320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1656378320 is an abundant number, since it is smaller than the sum of its proper divisors (2194701460).

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

1656378320 is a wasteful number, since it uses less digits than its factorization.

1656378320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20704742 (or 20704736 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 41.

The square root of 1656378320 is about 40698.6279867025. The cubic root of 1656378320 is about 1183.1864274859.

The spelling of 1656378320 in words is "one billion, six hundred fifty-six million, three hundred seventy-eight thousand, three hundred twenty".