1565782420 has 24 divisors (see below), whose sum is σ = 3309925248. Its totient is φ = 622164000.

The previous prime is 1565782411. The next prime is 1565782447. The reversal of 1565782420 is 242875651.

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 256216 + ... + 262255.

It is an arithmetic number, because the mean of its divisors is an integer number (137913552).

Almost surely, 2^1565782420 is an apocalyptic number.

1565782420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1565782420 is an abundant number, since it is smaller than the sum of its proper divisors (1744142828).

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

1565782420 is a wasteful number, since it uses less digits than its factorization.

1565782420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 518631 (or 518629 counting only the distinct ones).

The product of its (nonzero) digits is 134400, while the sum is 40.

The square root of 1565782420 is about 39569.9686631162. The cubic root of 1565782420 is about 1161.2092077472.

The spelling of 1565782420 in words is "one billion, five hundred sixty-five million, seven hundred eighty-two thousand, four hundred twenty".