51623140 has 24 divisors (see below), whose sum is σ = 111340152. Its totient is φ = 20090880.

The previous prime is 51623137. The next prime is 51623147. The reversal of 51623140 is 4132615.

51623140 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 21086464 + 30536676 = 4592^2 + 5526^2 .

It is not an unprimeable number, because it can be changed into a prime (51623147) 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, 34141 + ... + 35620.

It is an arithmetic number, because the mean of its divisors is an integer number (4639173).

Almost surely, 2^51623140 is an apocalyptic number.

It is an amenable number.

51623140 is an abundant number, since it is smaller than the sum of its proper divisors (59717012).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51623140 is a wasteful number, since it uses less digits than its factorization.

51623140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69807 (or 69805 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 51623140 is about 7184.9244950800. The cubic root of 51623140 is about 372.3472400367.

Adding to 51623140 its reverse (4132615), we get a palindrome (55755755).

The spelling of 51623140 in words is "fifty-one million, six hundred twenty-three thousand, one hundred forty".