1605732240 has 80 divisors (see below), whose sum is σ = 5688885888. Its totient is φ = 367024128.

The previous prime is 1605732169. The next prime is 1605732257. The reversal of 1605732240 is 422375061.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 1605732198 and 1605732207.

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 15 ways as a sum of consecutive naturals, for example, 476217 + ... + 479576.

Almost surely, 2^1605732240 is an apocalyptic number.

1605732240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1605732240 is an abundant number, since it is smaller than the sum of its proper divisors (4083153648).

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

1605732240 is a wasteful number, since it uses less digits than its factorization.

1605732240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 955816 (or 955810 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 30.

The square root of 1605732240 is about 40071.5889377998. The cubic root of 1605732240 is about 1171.0021948447.

The spelling of 1605732240 in words is "one billion, six hundred five million, seven hundred thirty-two thousand, two hundred forty".