75809906 has 4 divisors (see below), whose sum is σ = 113714862. Its totient is φ = 37904952.

The previous prime is 75809887. The next prime is 75809917. The reversal of 75809906 is 60990857.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 60918025 + 14891881 = 7805^2 + 3859^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18952475 + ... + 18952478.

Almost surely, 2^75809906 is an apocalyptic number.

75809906 is a deficient number, since it is larger than the sum of its proper divisors (37904956).

75809906 is a wasteful number, since it uses less digits than its factorization.

75809906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37904955.

The product of its (nonzero) digits is 136080, while the sum is 44.

The square root of 75809906 is about 8706.8884223929. Note that the first 3 decimals coincide. The cubic root of 75809906 is about 423.2289036366.

The spelling of 75809906 in words is "seventy-five million, eight hundred nine thousand, nine hundred six".