71783745 has 32 divisors (see below), whose sum is σ = 126904320. Its totient is φ = 34357440.

The previous prime is 71783717. The next prime is 71783749. The reversal of 71783745 is 54738717.

It is a happy number.

It is not a de Polignac number, because 71783745 - 2⁶ = 71783681 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 71783697 and 71783706.

It is not an unprimeable number, because it can be changed into a prime (71783749) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 10282 + ... + 15788.

It is an arithmetic number, because the mean of its divisors is an integer number (3965760).

Almost surely, 2^71783745 is an apocalyptic number.

It is an amenable number.

71783745 is a deficient number, since it is larger than the sum of its proper divisors (55120575).

71783745 is a wasteful number, since it uses less digits than its factorization.

71783745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5605.

The product of its digits is 164640, while the sum is 42.

The square root of 71783745 is about 8472.5288432675. The cubic root of 71783745 is about 415.5998390180.

The spelling of 71783745 in words is "seventy-one million, seven hundred eighty-three thousand, seven hundred forty-five".