71287040 has 144 divisors (see below), whose sum is σ = 191612736. Its totient is φ = 25190400.

The previous prime is 71287039. The next prime is 71287043. The reversal of 71287040 is 4078217.

It is a junction number, because it is equal to n+sod(n) for n = 71286994 and 71287012.

It is not an unprimeable number, because it can be changed into a prime (71287043) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 858839 + ... + 858921.

It is an arithmetic number, because the mean of its divisors is an integer number (1330644).

Almost surely, 2^71287040 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 71287040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (95806368).

71287040 is an abundant number, since it is smaller than the sum of its proper divisors (120325696).

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

71287040 is a wasteful number, since it uses less digits than its factorization.

71287040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176 (or 162 counting only the distinct ones).

The product of its (nonzero) digits is 3136, while the sum is 29.

The square root of 71287040 is about 8443.1652832335. The cubic root of 71287040 is about 414.6390435700.

The spelling of 71287040 in words is "seventy-one million, two hundred eighty-seven thousand, forty".