51281022804 has 48 divisors (see below), whose sum is σ = 132996427200. Its totient is φ = 15246499840.

The previous prime is 51281022803. The next prime is 51281022823. The reversal of 51281022804 is 40822018215.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51281022803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3658029 + ... + 3672020.

It is an arithmetic number, because the mean of its divisors is an integer number (2770758900).

Almost surely, 2^51281022804 is an apocalyptic number.

It is an amenable number.

51281022804 is an abundant number, since it is smaller than the sum of its proper divisors (81715404396).

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

51281022804 is a wasteful number, since it uses less digits than its factorization.

51281022804 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7330120 (or 7330118 counting only the distinct ones).

The product of its (nonzero) digits is 10240, while the sum is 33.

The spelling of 51281022804 in words is "fifty-one billion, two hundred eighty-one million, twenty-two thousand, eight hundred four".