71430240 has 144 divisors (see below), whose sum is σ = 261826992. Its totient is φ = 16321536.

The previous prime is 71430221. The next prime is 71430257. The reversal of 71430240 is 4203417.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 22002 + ... + 25038.

It is an arithmetic number, because the mean of its divisors is an integer number (1818243).

Almost surely, 2^71430240 is an apocalyptic number.

71430240 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 71430240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (130913496).

71430240 is an abundant number, since it is smaller than the sum of its proper divisors (190396752).

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

71430240 is a wasteful number, since it uses less digits than its factorization.

71430240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3069 (or 3054 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 21.

The square root of 71430240 is about 8451.6412607256. The cubic root of 71430240 is about 414.9164974493.

Adding to 71430240 its reverse (4203417), we get a palindrome (75633657).

The spelling of 71430240 in words is "seventy-one million, four hundred thirty thousand, two hundred forty".