1564866420 has 48 divisors (see below), whose sum is σ = 4718676480. Its totient is φ = 385197696.

The previous prime is 1564866403. The next prime is 1564866431. The reversal of 1564866420 is 246684651.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1002340 + ... + 1003899.

It is an arithmetic number, because the mean of its divisors is an integer number (98305760).

Almost surely, 2^1564866420 is an apocalyptic number.

1564866420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1564866420 is an abundant number, since it is smaller than the sum of its proper divisors (3153810060).

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

1564866420 is a wasteful number, since it uses less digits than its factorization.

1564866420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2006264 (or 2006262 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 42.

The square root of 1564866420 is about 39558.3925355922. The cubic root of 1564866420 is about 1160.9827235079.

The spelling of 1564866420 in words is "one billion, five hundred sixty-four million, eight hundred sixty-six thousand, four hundred twenty".