71861860 has 48 divisors (see below), whose sum is σ = 173287296. Its totient is φ = 24521472.

The previous prime is 71861851. The next prime is 71861917. The reversal of 71861860 is 6816817.

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, 31519 + ... + 33721.

It is an arithmetic number, because the mean of its divisors is an integer number (3610152).

Almost surely, 2^71861860 is an apocalyptic number.

71861860 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 71861860, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (86643648).

71861860 is an abundant number, since it is smaller than the sum of its proper divisors (101425436).

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

71861860 is a wasteful number, since it uses less digits than its factorization.

71861860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2452 (or 2450 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 37.

The square root of 71861860 is about 8477.1374885630. The cubic root of 71861860 is about 415.7505361458.

The spelling of 71861860 in words is "seventy-one million, eight hundred sixty-one thousand, eight hundred sixty".