71240540 has 96 divisors (see below), whose sum is σ = 186157440. Its totient is φ = 22339584.

The previous prime is 71240539. The next prime is 71240567. The reversal of 71240540 is 4504217.

It is a nialpdrome in base 14.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 87656 + ... + 88464.

It is an arithmetic number, because the mean of its divisors is an integer number (1939140).

Almost surely, 2^71240540 is an apocalyptic number.

71240540 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 71240540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (93078720).

71240540 is an abundant number, since it is smaller than the sum of its proper divisors (114916900).

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

71240540 is a wasteful number, since it uses less digits than its factorization.

71240540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 879 (or 877 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 23.

The square root of 71240540 is about 8440.4111274274. The cubic root of 71240540 is about 414.5488686506.

Adding to 71240540 its reverse (4504217), we get a palindrome (75744757).

The spelling of 71240540 in words is "seventy-one million, two hundred forty thousand, five hundred forty".