71388945 has 40 divisors (see below), whose sum is σ = 128589120. Its totient is φ = 37890720.

The previous prime is 71388943. The next prime is 71388953. The reversal of 71388945 is 54988317.

It is not a de Polignac number, because 71388945 - 2¹ = 71388943 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 71388945.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71388943) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 145150 + ... + 145640.

It is an arithmetic number, because the mean of its divisors is an integer number (3214728).

Almost surely, 2^71388945 is an apocalyptic number.

It is an amenable number.

71388945 is a deficient number, since it is larger than the sum of its proper divisors (57200175).

71388945 is a wasteful number, since it uses less digits than its factorization.

71388945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 867 (or 858 counting only the distinct ones).

The product of its digits is 241920, while the sum is 45.

The square root of 71388945 is about 8449.1978909243. The cubic root of 71388945 is about 414.8365253458.

The spelling of 71388945 in words is "seventy-one million, three hundred eighty-eight thousand, nine hundred forty-five".