71128503 has 16 divisors (see below), whose sum is σ = 109010400. Its totient is φ = 45783360.

The previous prime is 71128487. The next prime is 71128511. The reversal of 71128503 is 30582117.

It is not a de Polignac number, because 71128503 - 2⁴ = 71128487 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71128553) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44638 + ... + 46203.

It is an arithmetic number, because the mean of its divisors is an integer number (6813150).

Almost surely, 2^71128503 is an apocalyptic number.

71128503 is a deficient number, since it is larger than the sum of its proper divisors (37881897).

71128503 is a wasteful number, since it uses less digits than its factorization.

71128503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90879 (or 90873 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 27.

The square root of 71128503 is about 8433.7715762285. The cubic root of 71128503 is about 414.3314401089.

It can be divided in two parts, 71128 and 503, that added together give a triangular number (71631 = T₃₇₈).

The spelling of 71128503 in words is "seventy-one million, one hundred twenty-eight thousand, five hundred three".