71687904 has 24 divisors (see below), whose sum is σ = 188181000. Its totient is φ = 23895936.

The previous prime is 71687899. The next prime is 71687909. The reversal of 71687904 is 40978617.

It is an interprime number because it is at equal distance from previous prime (71687899) and next prime (71687909).

It is a tau number, because it is divible by the number of its divisors (24).

It is a hoax number, since the sum of its digits (42) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71687909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 373279 + ... + 373470.

It is an arithmetic number, because the mean of its divisors is an integer number (7840875).

Almost surely, 2^71687904 is an apocalyptic number.

It is an amenable number.

71687904 is an abundant number, since it is smaller than the sum of its proper divisors (116493096).

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

71687904 is a wasteful number, since it uses less digits than its factorization.

71687904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 746762 (or 746754 counting only the distinct ones).

The product of its (nonzero) digits is 84672, while the sum is 42.

The square root of 71687904 is about 8466.8709686637. The cubic root of 71687904 is about 415.4147959922.

The spelling of 71687904 in words is "seventy-one million, six hundred eighty-seven thousand, nine hundred four".