1605426320 has 40 divisors (see below), whose sum is σ = 3748149240. Its totient is φ = 639498240.

The previous prime is 1605426313. The next prime is 1605426323. The reversal of 1605426320 is 236245061.

It can be written as a sum of positive squares in 4 ways, for example, as 733759744 + 871666576 = 27088^2 + 29524^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-3 number, since 3×1605426320³ (a number of 29 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (1605426323) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22355 + ... + 60914.

It is an arithmetic number, because the mean of its divisors is an integer number (93703731).

Almost surely, 2^1605426320 is an apocalyptic number.

1605426320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1605426320 is an abundant number, since it is smaller than the sum of its proper divisors (2142722920).

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

1605426320 is a wasteful number, since it uses less digits than its factorization.

1605426320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83523 (or 83517 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 1605426320 is about 40067.7715876488. The cubic root of 1605426320 is about 1170.9278246737.

The spelling of 1605426320 in words is "one billion, six hundred five million, four hundred twenty-six thousand, three hundred twenty".