51687813800 has 48 divisors (see below), whose sum is σ = 137341908960. Its totient is φ = 17721535680.

The previous prime is 51687813791. The next prime is 51687813811. The reversal of 51687813800 is 831878615.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18458534 + ... + 18461333.

It is an arithmetic number, because the mean of its divisors is an integer number (2861289770).

Almost surely, 2^51687813800 is an apocalyptic number.

51687813800 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

51687813800 is an abundant number, since it is smaller than the sum of its proper divisors (85654095160).

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

51687813800 is a wasteful number, since it uses less digits than its factorization.

51687813800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36919890 (or 36919881 counting only the distinct ones).

The product of its (nonzero) digits is 322560, while the sum is 47.

The spelling of 51687813800 in words is "fifty-one billion, six hundred eighty-seven million, eight hundred thirteen thousand, eight hundred".