51647906 has 8 divisors (see below), whose sum is σ = 78182940. Its totient is φ = 25586928.

The previous prime is 51647879. The next prime is 51647963. The reversal of 51647906 is 60974615.

It can be written as a sum of positive squares in 2 ways, for example, as 51480625 + 167281 = 7175^2 + 409^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 51647906.

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, 118241 + ... + 118676.

Almost surely, 2^51647906 is an apocalyptic number.

51647906 is a deficient number, since it is larger than the sum of its proper divisors (26535034).

51647906 is a wasteful number, since it uses less digits than its factorization.

51647906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 237028.

The product of its (nonzero) digits is 45360, while the sum is 38.

The square root of 51647906 is about 7186.6477581693. The cubic root of 51647906 is about 372.4067745624.

The spelling of 51647906 in words is "fifty-one million, six hundred forty-seven thousand, nine hundred six".