71390240 has 24 divisors (see below), whose sum is σ = 168659820. Its totient is φ = 28556032.

The previous prime is 71390237. The next prime is 71390243. The reversal of 71390240 is 4209317.

It is an interprime number because it is at equal distance from previous prime (71390237) and next prime (71390243).

It can be written as a sum of positive squares in 2 ways, for example, as 69822736 + 1567504 = 8356^2 + 1252^2 .

It is not an unprimeable number, because it can be changed into a prime (71390243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 222935 + ... + 223254.

Almost surely, 2^71390240 is an apocalyptic number.

It is an amenable number.

71390240 is an abundant number, since it is smaller than the sum of its proper divisors (97269580).

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

71390240 is a wasteful number, since it uses less digits than its factorization.

71390240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 446204 (or 446196 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 71390240 is about 8449.2745250702. The cubic root of 71390240 is about 414.8390337176.

Adding to 71390240 its reverse (4209317), we get a palindrome (75599557).

The spelling of 71390240 in words is "seventy-one million, three hundred ninety thousand, two hundred forty".