538649757 has 20 divisors (see below), whose sum is σ = 805344540. Its totient is φ = 358789824.

The previous prime is 538649747. The next prime is 538649773. The reversal of 538649757 is 757946835.

It can be written as a sum of positive squares in 2 ways, for example, as 477903321 + 60746436 = 21861^2 + 7794^2 .

It is not a de Polignac number, because 538649757 - 2⁶ = 538649693 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (538649717) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 128263 + ... + 132395.

It is an arithmetic number, because the mean of its divisors is an integer number (40267227).

Almost surely, 2^538649757 is an apocalyptic number.

It is an amenable number.

538649757 is a deficient number, since it is larger than the sum of its proper divisors (266694783).

538649757 is a wasteful number, since it uses less digits than its factorization.

538649757 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5754 (or 5745 counting only the distinct ones).

The product of its digits is 6350400, while the sum is 54.

The square root of 538649757 is about 23208.8292897337. The cubic root of 538649757 is about 813.6459919311.

The spelling of 538649757 in words is "five hundred thirty-eight million, six hundred forty-nine thousand, seven hundred fifty-seven".