51663790 has 16 divisors (see below), whose sum is σ = 96202080. Its totient is φ = 19952800.

The previous prime is 51663751. The next prime is 51663791. The reversal of 51663790 is 9736615.

51663790 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 (51663791) 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, 88786 + ... + 89365.

It is an arithmetic number, because the mean of its divisors is an integer number (6012630).

Almost surely, 2^51663790 is an apocalyptic number.

51663790 is a deficient number, since it is larger than the sum of its proper divisors (44538290).

51663790 is a wasteful number, since it uses less digits than its factorization.

51663790 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178187.

The product of its (nonzero) digits is 34020, while the sum is 37.

The square root of 51663790 is about 7187.7527781637. The cubic root of 51663790 is about 372.4449477971. Note that the first 3 decimals are identical.

The spelling of 51663790 in words is "fifty-one million, six hundred sixty-three thousand, seven hundred ninety".