71242740 has 144 divisors (see below), whose sum is σ = 227852352. Its totient is φ = 18683136.

The previous prime is 71242739. The next prime is 71242747. The reversal of 71242740 is 4724217.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71242747) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 519952 + ... + 520088.

It is an arithmetic number, because the mean of its divisors is an integer number (1582308).

Almost surely, 2^71242740 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 71242740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (113926176).

71242740 is an abundant number, since it is smaller than the sum of its proper divisors (156609612).

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

71242740 is a wasteful number, since it uses less digits than its factorization.

71242740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 268 (or 254 counting only the distinct ones).

The product of its (nonzero) digits is 3136, while the sum is 27.

The square root of 71242740 is about 8440.5414518264. The cubic root of 71242740 is about 414.5531358750.

Adding to 71242740 its reverse (4724217), we get a palindrome (75966957).

The spelling of 71242740 in words is "seventy-one million, two hundred forty-two thousand, seven hundred forty".