538464644 has 36 divisors (see below), whose sum is σ = 979980372. Its totient is φ = 258831360.

The previous prime is 538464643. The next prime is 538464659. The reversal of 538464644 is 446464835.

It can be written as a sum of positive squares in 6 ways, for example, as 192876544 + 345588100 = 13888^2 + 18590^2 .

It is a junction number, because it is equal to n+sod(n) for n = 538464595 and 538464604.

It is not an unprimeable number, because it can be changed into a prime (538464643) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 490304 + ... + 491400.

It is an arithmetic number, because the mean of its divisors is an integer number (27221677).

Almost surely, 2^538464644 is an apocalyptic number.

It is an amenable number.

538464644 is a deficient number, since it is larger than the sum of its proper divisors (441515728).

538464644 is a wasteful number, since it uses less digits than its factorization.

538464644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1256 (or 1213 counting only the distinct ones).

The product of its digits is 1105920, while the sum is 44.

The square root of 538464644 is about 23204.8409604548. The cubic root of 538464644 is about 813.5527750770.

The spelling of 538464644 in words is "five hundred thirty-eight million, four hundred sixty-four thousand, six hundred forty-four".