51204402 has 24 divisors (see below), whose sum is σ = 111683520. Its totient is φ = 16954200.

The previous prime is 51204383. The next prime is 51204407. The reversal of 51204402 is 20440215.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (51204407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6702 + ... + 12137.

It is an arithmetic number, because the mean of its divisors is an integer number (4653480).

Almost surely, 2^51204402 is an apocalyptic number.

51204402 is an abundant number, since it is smaller than the sum of its proper divisors (60479118).

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

51204402 is a wasteful number, since it uses less digits than its factorization.

51204402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18998 (or 18995 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 18.

The square root of 51204402 is about 7155.7251204892. The cubic root of 51204402 is about 371.3377481935.

Adding to 51204402 its reverse (20440215), we get a palindrome (71644617).

The spelling of 51204402 in words is "fifty-one million, two hundred four thousand, four hundred two".