51808426 has 4 divisors (see below), whose sum is σ = 77712642. Its totient is φ = 25904212.

The previous prime is 51808417. The next prime is 51808433. The reversal of 51808426 is 62480815.

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., 51768025 + 40401 = 7195^2 + 201^2 .

It is a super-2 number, since 2×51808426² = 5368226009194952, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 51808391 and 51808400.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12952105 + ... + 12952108.

Almost surely, 2^51808426 is an apocalyptic number.

51808426 is a deficient number, since it is larger than the sum of its proper divisors (25904216).

51808426 is a wasteful number, since it uses less digits than its factorization.

51808426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25904215.

The product of its (nonzero) digits is 15360, while the sum is 34.

The square root of 51808426 is about 7197.8070271438. The cubic root of 51808426 is about 372.7921849090.

The spelling of 51808426 in words is "fifty-one million, eight hundred eight thousand, four hundred twenty-six".