71285045 has 24 divisors (see below), whose sum is σ = 95855400. Its totient is φ = 50808576.

The previous prime is 71285023. The next prime is 71285047. The reversal of 71285045 is 54058217.

71285045 = 233² + 234² + ... + 609².

It can be written as a sum of positive squares in 12 ways, for example, as 25140196 + 46144849 = 5014^2 + 6793^2 .

It is a de Polignac number, because none of the positive numbers 2^k-71285045 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71285047) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 23051 + ... + 25959.

It is an arithmetic number, because the mean of its divisors is an integer number (3993975).

Almost surely, 2^71285045 is an apocalyptic number.

It is an amenable number.

71285045 is a deficient number, since it is larger than the sum of its proper divisors (24570355).

71285045 is a wasteful number, since it uses less digits than its factorization.

71285045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2969 (or 2956 counting only the distinct ones).

The product of its (nonzero) digits is 11200, while the sum is 32.

The square root of 71285045 is about 8443.0471395107. The cubic root of 71285045 is about 414.6351755803.

The spelling of 71285045 in words is "seventy-one million, two hundred eighty-five thousand, forty-five".