1065778420 has 72 divisors (see below), whose sum is σ = 2693393640. Its totient is φ = 352800000.

The previous prime is 1065778411. The next prime is 1065778423. The reversal of 1065778420 is 248775601.

It can be written as a sum of positive squares in 4 ways, for example, as 77053284 + 988725136 = 8778^2 + 31444^2 .

It is a super-2 number, since 2×1065778420² = 2271767281075392800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1065778423) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 9670 + ... + 47170.

It is an arithmetic number, because the mean of its divisors is an integer number (37408245).

Almost surely, 2^1065778420 is an apocalyptic number.

1065778420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1065778420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1346696820).

1065778420 is an abundant number, since it is smaller than the sum of its proper divisors (1627615220).

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

1065778420 is a wasteful number, since it uses less digits than its factorization.

1065778420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37553 (or 37544 counting only the distinct ones).

The product of its (nonzero) digits is 94080, while the sum is 40.

The square root of 1065778420 is about 32646.2619605982. The cubic root of 1065778420 is about 1021.4622178475.

The spelling of 1065778420 in words is "one billion, sixty-five million, seven hundred seventy-eight thousand, four hundred twenty".