1645357128 has 32 divisors (see below), whose sum is σ = 4130475360. Its totient is φ = 546174720.

The previous prime is 1645357127. The next prime is 1645357139. The reversal of 1645357128 is 8217535461.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 1645357128.

It is not an unprimeable number, because it can be changed into a prime (1645357127) 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, 136450 + ... + 148017.

It is an arithmetic number, because the mean of its divisors is an integer number (129077355).

Almost surely, 2^1645357128 is an apocalyptic number.

It is an amenable number.

1645357128 is an abundant number, since it is smaller than the sum of its proper divisors (2485118232).

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

1645357128 is a wasteful number, since it uses less digits than its factorization.

1645357128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 284717 (or 284713 counting only the distinct ones).

The product of its digits is 201600, while the sum is 42.

The square root of 1645357128 is about 40563.0019599142. The cubic root of 1645357128 is about 1180.5563612142.

The spelling of 1645357128 in words is "one billion, six hundred forty-five million, three hundred fifty-seven thousand, one hundred twenty-eight".