71323140 has 48 divisors (see below), whose sum is σ = 228235392. Its totient is φ = 16302336.

The previous prime is 71323123. The next prime is 71323141. The reversal of 71323140 is 4132317.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (71323141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 84489 + ... + 85328.

It is an arithmetic number, because the mean of its divisors is an integer number (4754904).

Almost surely, 2^71323140 is an apocalyptic number.

71323140 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

71323140 is an abundant number, since it is smaller than the sum of its proper divisors (156912252).

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

71323140 is a wasteful number, since it uses less digits than its factorization.

71323140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169836 (or 169834 counting only the distinct ones).

The product of its (nonzero) digits is 504, while the sum is 21.

The square root of 71323140 is about 8445.3028364885. The cubic root of 71323140 is about 414.7090233003.

Adding to 71323140 its reverse (4132317), we get a palindrome (75455457).

The spelling of 71323140 in words is "seventy-one million, three hundred twenty-three thousand, one hundred forty".