51280089920 has 42 divisors (see below), whose sum is σ = 122120361042. Its totient is φ = 20510415616.

The previous prime is 51280089907. The next prime is 51280089929. The reversal of 51280089920 is 2998008215.

It can be written as a sum of positive squares in only one way, i.e., 41024071936 + 10256017984 = 202544^2 + 101272^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51280089929) 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 5 ways as a sum of consecutive naturals, for example, 4044551 + ... + 4057209.

Almost surely, 2^51280089920 is an apocalyptic number.

It is an amenable number.

51280089920 is an abundant number, since it is smaller than the sum of its proper divisors (70840271122).

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

51280089920 is an frugal number, since it uses more digits than its factorization.

51280089920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25335 (or 12666 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 44.

The spelling of 51280089920 in words is "fifty-one billion, two hundred eighty million, eighty-nine thousand, nine hundred twenty".