1646740764 has 72 divisors (see below), whose sum is σ = 4219003152. Its totient is φ = 541516800.

The previous prime is 1646740763. The next prime is 1646740813. The reversal of 1646740764 is 4670476461.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1646740763) 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 23 ways as a sum of consecutive naturals, for example, 1282867 + ... + 1284149.

It is an arithmetic number, because the mean of its divisors is an integer number (58597266).

Almost surely, 2^1646740764 is an apocalyptic number.

It is an amenable number.

1646740764 is an abundant number, since it is smaller than the sum of its proper divisors (2572262388).

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

1646740764 is a wasteful number, since it uses less digits than its factorization.

1646740764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1747 (or 1742 counting only the distinct ones).

The product of its (nonzero) digits is 677376, while the sum is 45.

The square root of 1646740764 is about 40580.0537702946. The cubic root of 1646740764 is about 1180.8871916441.

The spelling of 1646740764 in words is "one billion, six hundred forty-six million, seven hundred forty thousand, seven hundred sixty-four".