71640336 has 40 divisors (see below), whose sum is σ = 194813920. Its totient is φ = 22622976.

The previous prime is 71640323. The next prime is 71640341. The reversal of 71640336 is 63304617.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38365 + ... + 40188.

It is an arithmetic number, because the mean of its divisors is an integer number (4870348).

Almost surely, 2^71640336 is an apocalyptic number.

71640336 is a gapful number since it is divisible by the number (76) formed by its first and last digit.

It is an amenable number.

71640336 is an abundant number, since it is smaller than the sum of its proper divisors (123173584).

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

71640336 is a wasteful number, since it uses less digits than its factorization.

71640336 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78583 (or 78577 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 30.

The square root of 71640336 is about 8464.0614364500. The cubic root of 71640336 is about 415.3228938155.

The spelling of 71640336 in words is "seventy-one million, six hundred forty thousand, three hundred thirty-six".