51646390 has 16 divisors (see below), whose sum is σ = 96169680. Its totient is φ = 19946080.

The previous prime is 51646369. The next prime is 51646393. The reversal of 51646390 is 9364615.

51646390 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51646393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 88756 + ... + 89335.

It is an arithmetic number, because the mean of its divisors is an integer number (6010605).

Almost surely, 2^51646390 is an apocalyptic number.

51646390 is a deficient number, since it is larger than the sum of its proper divisors (44523290).

51646390 is a wasteful number, since it uses less digits than its factorization.

51646390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178127.

The product of its (nonzero) digits is 19440, while the sum is 34.

The square root of 51646390 is about 7186.5422840195. The cubic root of 51646390 is about 372.4031308252.

The spelling of 51646390 in words is "fifty-one million, six hundred forty-six thousand, three hundred ninety".