71683780 has 96 divisors (see below), whose sum is σ = 180633600. Its totient is φ = 23379840.

The previous prime is 71683757. The next prime is 71683793. The reversal of 71683780 is 8738617.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 360121 + ... + 360319.

It is an arithmetic number, because the mean of its divisors is an integer number (1881600).

Almost surely, 2^71683780 is an apocalyptic number.

71683780 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 71683780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (90316800).

71683780 is an abundant number, since it is smaller than the sum of its proper divisors (108949820).

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

71683780 is a wasteful number, since it uses less digits than its factorization.

71683780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 329 (or 327 counting only the distinct ones).

The product of its (nonzero) digits is 56448, while the sum is 40.

The square root of 71683780 is about 8466.6274277306. The cubic root of 71683780 is about 415.4068299646.

The spelling of 71683780 in words is "seventy-one million, six hundred eighty-three thousand, seven hundred eighty".