51308806 has 4 divisors (see below), whose sum is σ = 76963212. Its totient is φ = 25654402.

The previous prime is 51308773. The next prime is 51308827. The reversal of 51308806 is 60880315.

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

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12827200 + ... + 12827203.

It is an arithmetic number, because the mean of its divisors is an integer number (19240803).

Almost surely, 2^51308806 is an apocalyptic number.

51308806 is a deficient number, since it is larger than the sum of its proper divisors (25654406).

51308806 is a wasteful number, since it uses less digits than its factorization.

51308806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25654405.

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 51308806 is about 7163.0165433287. The cubic root of 51308806 is about 371.5899584521.

The spelling of 51308806 in words is "fifty-one million, three hundred eight thousand, eight hundred six".