71390736 has 30 divisors (see below), whose sum is σ = 199795310. Its totient is φ = 23796864.

The previous prime is 71390731. The next prime is 71390741. The reversal of 71390736 is 63709317.

It is an interprime number because it is at equal distance from previous prime (71390731) and next prime (71390741).

It can be written as a sum of positive squares in only one way, i.e., 58430736 + 12960000 = 7644^2 + 3600^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 71390736.

It is not an unprimeable number, because it can be changed into a prime (71390731) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 247741 + ... + 248028.

Almost surely, 2^71390736 is an apocalyptic number.

It is an amenable number.

71390736 is an abundant number, since it is smaller than the sum of its proper divisors (128404574).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

71390736 is a wasteful number, since it uses less digits than its factorization.

71390736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 495783 (or 495774 counting only the distinct ones).

The product of its (nonzero) digits is 23814, while the sum is 36.

The square root of 71390736 is about 8449.3038766516. The cubic root of 71390736 is about 414.8399944450.

The spelling of 71390736 in words is "seventy-one million, three hundred ninety thousand, seven hundred thirty-six".