71664340 has 24 divisors (see below), whose sum is σ = 164176992. Its totient is φ = 26059680.

The previous prime is 71664323. The next prime is 71664349. The reversal of 71664340 is 4346617.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71664349) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 162654 + ... + 163093.

It is an arithmetic number, because the mean of its divisors is an integer number (6840708).

Almost surely, 2^71664340 is an apocalyptic number.

It is an amenable number.

71664340 is an abundant number, since it is smaller than the sum of its proper divisors (92512652).

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

71664340 is a wasteful number, since it uses less digits than its factorization.

71664340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 325767 (or 325765 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 31.

The square root of 71664340 is about 8465.4793130690. The cubic root of 71664340 is about 415.3692750305.

It can be divided in two parts, 716 and 64340, that added together give a palindrome (65056).

The spelling of 71664340 in words is "seventy-one million, six hundred sixty-four thousand, three hundred forty".