71783730 has 96 divisors (see below), whose sum is σ = 193330800. Its totient is φ = 18470400.

The previous prime is 71783717. The next prime is 71783749. The reversal of 71783730 is 3738717.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 44315649 + 27468081 = 6657^2 + 5241^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 481696 + ... + 481844.

Almost surely, 2^71783730 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 71783730, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (96665400).

71783730 is an abundant number, since it is smaller than the sum of its proper divisors (121547070).

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

71783730 is a wasteful number, since it uses less digits than its factorization.

71783730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 316 (or 313 counting only the distinct ones).

The product of its (nonzero) digits is 24696, while the sum is 36.

The square root of 71783730 is about 8472.5279580536. The cubic root of 71783730 is about 415.5998100700.

The spelling of 71783730 in words is "seventy-one million, seven hundred eighty-three thousand, seven hundred thirty".