51291729480 has 32 divisors (see below), whose sum is σ = 153875188800. Its totient is φ = 13677794496.

The previous prime is 51291729479. The next prime is 51291729497. The reversal of 51291729480 is 8492719215.

It is a happy number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 213715420 + ... + 213715659.

It is an arithmetic number, because the mean of its divisors is an integer number (4808599650).

Almost surely, 2^51291729480 is an apocalyptic number.

It is an amenable number.

51291729480 is an abundant number, since it is smaller than the sum of its proper divisors (102583459320).

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

51291729480 is a wasteful number, since it uses less digits than its factorization.

51291729480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 427431093 (or 427431089 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 48.

The spelling of 51291729480 in words is "fifty-one billion, two hundred ninety-one million, seven hundred twenty-nine thousand, four hundred eighty".