71390320 has 40 divisors (see below), whose sum is σ = 169850736. Its totient is φ = 27890688.

The previous prime is 71390317. The next prime is 71390323. The reversal of 71390320 is 2309317.

It is an interprime number because it is at equal distance from previous prime (71390317) and next prime (71390323).

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71390323) 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, 6937 + ... + 13816.

Almost surely, 2^71390320 is an apocalyptic number.

It is an amenable number.

71390320 is an abundant number, since it is smaller than the sum of its proper divisors (98460416).

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

71390320 is a wasteful number, since it uses less digits than its factorization.

71390320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20809 (or 20803 counting only the distinct ones).

The product of its (nonzero) digits is 1134, while the sum is 25.

The square root of 71390320 is about 8449.2792592031. The cubic root of 71390320 is about 414.8391886739.

Adding to 71390320 its reverse (2309317), we get a palindrome (73699637).

The spelling of 71390320 in words is "seventy-one million, three hundred ninety thousand, three hundred twenty".