1605247728 has 40 divisors (see below), whose sum is σ = 4739303808. Its totient is φ = 458642112.

The previous prime is 1605247723. The next prime is 1605247747. The reversal of 1605247728 is 8277425061.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a self number, because there is not a number n which added to its sum of digits gives 1605247728.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1605247723) by changing a digit.

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, 2388426 + ... + 2389097.

Almost surely, 2^1605247728 is an apocalyptic number.

It is an amenable number.

1605247728 is an abundant number, since it is smaller than the sum of its proper divisors (3134056080).

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

1605247728 is a wasteful number, since it uses less digits than its factorization.

1605247728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4777541 (or 4777535 counting only the distinct ones).

The product of its (nonzero) digits is 188160, while the sum is 42.

The square root of 1605247728 is about 40065.5429016006. The cubic root of 1605247728 is about 1170.8844039959.

The spelling of 1605247728 in words is "one billion, six hundred five million, two hundred forty-seven thousand, seven hundred twenty-eight".