1645764756 has 12 divisors (see below), whose sum is σ = 3840117792. Its totient is φ = 548588248.

The previous prime is 1645764727. The next prime is 1645764767. The reversal of 1645764756 is 6574675461.

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 1645764699 and 1645764708.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68573520 + ... + 68573543.

It is an arithmetic number, because the mean of its divisors is an integer number (320009816).

Almost surely, 2^1645764756 is an apocalyptic number.

It is an amenable number.

1645764756 is an abundant number, since it is smaller than the sum of its proper divisors (2194353036).

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

1645764756 is a wasteful number, since it uses less digits than its factorization.

1645764756 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137147070 (or 137147068 counting only the distinct ones).

The product of its digits is 4233600, while the sum is 51.

The square root of 1645764756 is about 40568.0262768600. The cubic root of 1645764756 is about 1180.6538452366.

The spelling of 1645764756 in words is "one billion, six hundred forty-five million, seven hundred sixty-four thousand, seven hundred fifty-six".