71563538 has 16 divisors (see below), whose sum is σ = 113316000. Its totient is φ = 33802272.

The previous prime is 71563537. The next prime is 71563543. The reversal of 71563538 is 83536517.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (71563537) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11918 + ... + 16886.

It is an arithmetic number, because the mean of its divisors is an integer number (7082250).

Almost surely, 2^71563538 is an apocalyptic number.

71563538 is a deficient number, since it is larger than the sum of its proper divisors (41752462).

71563538 is a wasteful number, since it uses less digits than its factorization.

71563538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5369.

The product of its digits is 75600, while the sum is 38.

The square root of 71563538 is about 8459.5235090400. The cubic root of 71563538 is about 415.1744328897.

The spelling of 71563538 in words is "seventy-one million, five hundred sixty-three thousand, five hundred thirty-eight".