1645032072 has 16 divisors (see below), whose sum is σ = 4112580240. Its totient is φ = 548344016.

The previous prime is 1645032049. The next prime is 1645032097. The reversal of 1645032072 is 2702305461.

It is a super-2 number, since 2×1645032072² = 5412261035817226368, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34271478 + ... + 34271525.

It is an arithmetic number, because the mean of its divisors is an integer number (257036265).

Almost surely, 2^1645032072 is an apocalyptic number.

1645032072 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1645032072 is an abundant number, since it is smaller than the sum of its proper divisors (2467548168).

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

1645032072 is a wasteful number, since it uses less digits than its factorization.

1645032072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68543012 (or 68543008 counting only the distinct ones).

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

The square root of 1645032072 is about 40558.9949579622. The cubic root of 1645032072 is about 1180.4786127028.

The spelling of 1645032072 in words is "one billion, six hundred forty-five million, thirty-two thousand, seventy-two".