71918040 has 64 divisors (see below), whose sum is σ = 227116800. Its totient is φ = 18168192.

The previous prime is 71918039. The next prime is 71918053. The reversal of 71918040 is 4081917.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 71917989 and 71918007.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13492 + ... + 18051.

It is an arithmetic number, because the mean of its divisors is an integer number (3548700).

Almost surely, 2^71918040 is an apocalyptic number.

It is an amenable number.

71918040 is an abundant number, since it is smaller than the sum of its proper divisors (155198760).

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

71918040 is a wasteful number, since it uses less digits than its factorization.

71918040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31576 (or 31572 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 30.

The square root of 71918040 is about 8480.4504597338. The cubic root of 71918040 is about 415.8588494250.

Adding to 71918040 its reverse (4081917), we get a palindrome (75999957).

The spelling of 71918040 in words is "seventy-one million, nine hundred eighteen thousand, forty".