71278740 has 144 divisors (see below), whose sum is σ = 236291328. Its totient is φ = 17286912.

The previous prime is 71278699. The next prime is 71278789. The reversal of 71278740 is 4787217.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 71278695 and 71278704.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 194037 + ... + 194403.

It is an arithmetic number, because the mean of its divisors is an integer number (1640912).

Almost surely, 2^71278740 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 71278740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (118145664).

71278740 is an abundant number, since it is smaller than the sum of its proper divisors (165012588).

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

71278740 is a wasteful number, since it uses less digits than its factorization.

71278740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 478 (or 473 counting only the distinct ones).

The product of its (nonzero) digits is 21952, while the sum is 36.

The square root of 71278740 is about 8442.6737471017. The cubic root of 71278740 is about 414.6229507074.

The spelling of 71278740 in words is "seventy-one million, two hundred seventy-eight thousand, seven hundred forty".