71684613 has 96 divisors (see below), whose sum is σ = 142222080. Its totient is φ = 33592320.

The previous prime is 71684611. The next prime is 71684621. The reversal of 71684613 is 31648617.

It is not a de Polignac number, because 71684613 - 2¹ = 71684611 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

Its product of digits (24192) is a multiple of the sum of its prime divisors (216).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71684611) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 657603 + ... + 657711.

It is an arithmetic number, because the mean of its divisors is an integer number (1481480).

Almost surely, 2^71684613 is an apocalyptic number.

71684613 is a gapful number since it is divisible by the number (73) formed by its first and last digit.

It is an amenable number.

71684613 is a deficient number, since it is larger than the sum of its proper divisors (70537467).

71684613 is a wasteful number, since it uses less digits than its factorization.

71684613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 219 (or 216 counting only the distinct ones).

The product of its digits is 24192, while the sum is 36.

The square root of 71684613 is about 8466.6766207291. The cubic root of 71684613 is about 415.4084390341.

It can be divided in two parts, 7168 and 4613, that added together give a triangular number (11781 = T₁₅₃).

The spelling of 71684613 in words is "seventy-one million, six hundred eighty-four thousand, six hundred thirteen".