51640046 has 4 divisors (see below), whose sum is σ = 77460072. Its totient is φ = 25820022.

The previous prime is 51640031. The next prime is 51640051. The reversal of 51640046 is 64004615.

It is a happy number.

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

It is a junction number, because it is equal to n+sod(n) for n = 51639997 and 51640024.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12910010 + ... + 12910013.

It is an arithmetic number, because the mean of its divisors is an integer number (19365018).

Almost surely, 2^51640046 is an apocalyptic number.

51640046 is a deficient number, since it is larger than the sum of its proper divisors (25820026).

51640046 is a wasteful number, since it uses less digits than its factorization.

51640046 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25820025.

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 51640046 is about 7186.1008899124. The cubic root of 51640046 is about 372.3878821169.

The spelling of 51640046 in words is "fifty-one million, six hundred forty thousand, forty-six".