71643740 has 48 divisors (see below), whose sum is σ = 172429824. Its totient is φ = 24494400.

The previous prime is 71643731. The next prime is 71643743. The reversal of 71643740 is 4734617.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 71643697 and 71643706.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71643743) by changing a digit.

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, 87935 + ... + 88745.

It is an arithmetic number, because the mean of its divisors is an integer number (3592288).

Almost surely, 2^71643740 is an apocalyptic number.

71643740 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

71643740 is an abundant number, since it is smaller than the sum of its proper divisors (100786084).

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

71643740 is a wasteful number, since it uses less digits than its factorization.

71643740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1458 (or 1456 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 32.

The square root of 71643740 is about 8464.2625195583. The cubic root of 71643740 is about 415.3294717520.

The spelling of 71643740 in words is "seventy-one million, six hundred forty-three thousand, seven hundred forty".