71688190 has 32 divisors (see below), whose sum is σ = 149503680. Its totient is φ = 24240384.

The previous prime is 71688187. The next prime is 71688193. The reversal of 71688190 is 9188617.

It is an interprime number because it is at equal distance from previous prime (71688187) and next prime (71688193).

It is a super-2 number, since 2×71688190² = 10278393170952200, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71688193) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1905 + ... + 12124.

It is an arithmetic number, because the mean of its divisors is an integer number (4671990).

Almost surely, 2^71688190 is an apocalyptic number.

71688190 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

71688190 is an abundant number, since it is smaller than the sum of its proper divisors (77815490).

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

71688190 is a wasteful number, since it uses less digits than its factorization.

71688190 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14116.

The product of its (nonzero) digits is 24192, while the sum is 40.

The square root of 71688190 is about 8466.8878580031. The cubic root of 71688190 is about 415.4153484260.

The spelling of 71688190 in words is "seventy-one million, six hundred eighty-eight thousand, one hundred ninety".