75721706 has 8 divisors (see below), whose sum is σ = 120263940. Its totient is φ = 35633728.

The previous prime is 75721691. The next prime is 75721733. The reversal of 75721706 is 60712757.

It can be written as a sum of positive squares in 2 ways, for example, as 69039481 + 6682225 = 8309^2 + 2585^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1113521 + ... + 1113588.

Almost surely, 2^75721706 is an apocalyptic number.

75721706 is a deficient number, since it is larger than the sum of its proper divisors (44542234).

75721706 is a wasteful number, since it uses less digits than its factorization.

75721706 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2227128.

The product of its (nonzero) digits is 20580, while the sum is 35.

The square root of 75721706 is about 8701.8219931230. The cubic root of 75721706 is about 423.0647066462.

The spelling of 75721706 in words is "seventy-five million, seven hundred twenty-one thousand, seven hundred six".