71011640 has 32 divisors (see below), whose sum is σ = 182602080. Its totient is φ = 24346752.

The previous prime is 71011639. The next prime is 71011651. The reversal of 71011640 is 4611017.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 126527 + ... + 127086.

It is an arithmetic number, because the mean of its divisors is an integer number (5706315).

Almost surely, 2^71011640 is an apocalyptic number.

71011640 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

71011640 is an abundant number, since it is smaller than the sum of its proper divisors (111590440).

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

71011640 is a wasteful number, since it uses less digits than its factorization.

71011640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 253631 (or 253627 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 20.

The square root of 71011640 is about 8426.8404517945. The cubic root of 71011640 is about 414.1044024000.

Adding to 71011640 its reverse (4611017), we get a palindrome (75622657).

The spelling of 71011640 in words is "seventy-one million, eleven thousand, six hundred forty".