71681890 has 32 divisors (see below), whose sum is σ = 148604544. Its totient is φ = 24385920.

The previous prime is 71681887. The next prime is 71681921. The reversal of 71681890 is 9818617.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5262 + ... + 13078.

It is an arithmetic number, because the mean of its divisors is an integer number (4643892).

Almost surely, 2^71681890 is an apocalyptic number.

71681890 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

71681890 is an abundant number, since it is smaller than the sum of its proper divisors (76922654).

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

71681890 is a wasteful number, since it uses less digits than its factorization.

71681890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7962.

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

The square root of 71681890 is about 8466.5158123044. The cubic root of 71681890 is about 415.4031790884.

The spelling of 71681890 in words is "seventy-one million, six hundred eighty-one thousand, eight hundred ninety".