51440090 has 32 divisors (see below), whose sum is σ = 101848320. Its totient is φ = 18586944.

The previous prime is 51440071. The next prime is 51440099. The reversal of 51440090 is 9004415.

51440090 = T₆₅ + T₆₆ + ... + T₆₇₅.

It is a happy number.

51440090 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (51440099) 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 15 ways as a sum of consecutive naturals, for example, 1901 + ... + 10319.

It is an arithmetic number, because the mean of its divisors is an integer number (3182760).

Almost surely, 2^51440090 is an apocalyptic number.

51440090 is a deficient number, since it is larger than the sum of its proper divisors (50408230).

51440090 is a wasteful number, since it uses less digits than its factorization.

51440090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8486.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 51440090 is about 7172.1747050668. The cubic root of 51440090 is about 371.9066179835.

It can be divided in two parts, 514 and 40090, that added together give a palindrome (40604).

The spelling of 51440090 in words is "fifty-one million, four hundred forty thousand, ninety".