1644231604 has 24 divisors (see below), whose sum is σ = 2967918408. Its totient is φ = 796446720.

The previous prime is 1644231593. The next prime is 1644231629. The reversal of 1644231604 is 4061324461.

It can be written as a sum of positive squares in 4 ways, for example, as 138015504 + 1506216100 = 11748^2 + 38810^2 .

It is a super-3 number, since 3×1644231604³ (a number of 29 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10644 + ... + 58324.

It is an arithmetic number, because the mean of its divisors is an integer number (123663267).

Almost surely, 2^1644231604 is an apocalyptic number.

It is an amenable number.

1644231604 is a deficient number, since it is larger than the sum of its proper divisors (1323686804).

1644231604 is a wasteful number, since it uses less digits than its factorization.

1644231604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47955 (or 47953 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 31.

The square root of 1644231604 is about 40549.1258105523. The cubic root of 1644231604 is about 1180.2871091086.

The spelling of 1644231604 in words is "one billion, six hundred forty-four million, two hundred thirty-one thousand, six hundred four".