51840164 has 6 divisors (see below), whose sum is σ = 90720294. Its totient is φ = 25920080.

The previous prime is 51840163. The next prime is 51840167. The reversal of 51840164 is 46104815.

It can be written as a sum of positive squares in only one way, i.e., 51265600 + 574564 = 7160^2 + 758^2 .

It is not an unprimeable number, because it can be changed into a prime (51840163) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6480017 + ... + 6480024.

It is an arithmetic number, because the mean of its divisors is an integer number (15120049).

Almost surely, 2^51840164 is an apocalyptic number.

It is an amenable number.

51840164 is a deficient number, since it is larger than the sum of its proper divisors (38880130).

51840164 is a wasteful number, since it uses less digits than its factorization.

51840164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12960045 (or 12960043 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 29.

The square root of 51840164 is about 7200.0113888799. The cubic root of 51840164 is about 372.8682939132.

Adding to 51840164 its reverse (46104815), we get a palindrome (97944979).

The spelling of 51840164 in words is "fifty-one million, eight hundred forty thousand, one hundred sixty-four".