71881620 has 48 divisors (see below), whose sum is σ = 204283968. Its totient is φ = 18881280.

The previous prime is 71881609. The next prime is 71881657. The reversal of 71881620 is 2618817.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4921 + ... + 12960.

It is an arithmetic number, because the mean of its divisors is an integer number (4255916).

Almost surely, 2^71881620 is an apocalyptic number.

It is an amenable number.

71881620 is an abundant number, since it is smaller than the sum of its proper divisors (132402348).

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

71881620 is a wasteful number, since it uses less digits than its factorization.

71881620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17960 (or 17958 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 33.

The square root of 71881620 is about 8478.3028962169. The cubic root of 71881620 is about 415.7886392402.

The spelling of 71881620 in words is "seventy-one million, eight hundred eighty-one thousand, six hundred twenty".