1645630746 has 16 divisors (see below), whose sum is σ = 3292713408. Its totient is φ = 548301600.

The previous prime is 1645630741. The next prime is 1645630757. The reversal of 1645630746 is 6470365461.

It is a junction number, because it is equal to n+sod(n) for n = 1645630698 and 1645630707.

It is not an unprimeable number, because it can be changed into a prime (1645630741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45475 + ... + 73206.

It is an arithmetic number, because the mean of its divisors is an integer number (205794588).

Almost surely, 2^1645630746 is an apocalyptic number.

1645630746 is an abundant number, since it is smaller than the sum of its proper divisors (1647082662).

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

1645630746 is a wasteful number, since it uses less digits than its factorization.

1645630746 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120997.

The product of its (nonzero) digits is 362880, while the sum is 42.

The square root of 1645630746 is about 40566.3745730377. The cubic root of 1645630746 is about 1180.6217985917.

The spelling of 1645630746 in words is "one billion, six hundred forty-five million, six hundred thirty thousand, seven hundred forty-six".