71905730 has 32 divisors (see below), whose sum is σ = 141314544. Its totient is φ = 26182656.

The previous prime is 71905711. The next prime is 71905753. The reversal of 71905730 is 3750917.

It can be written as a sum of positive squares in 8 ways, for example, as 2866249 + 69039481 = 1693^2 + 8309^2 .

It is a Curzon number.

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, 5702 + ... + 13278.

Almost surely, 2^71905730 is an apocalyptic number.

71905730 is a deficient number, since it is larger than the sum of its proper divisors (69408814).

71905730 is a wasteful number, since it uses less digits than its factorization.

71905730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7670.

The product of its (nonzero) digits is 6615, while the sum is 32.

The square root of 71905730 is about 8479.7246417558. The cubic root of 71905730 is about 415.8351209579.

The spelling of 71905730 in words is "seventy-one million, nine hundred five thousand, seven hundred thirty".