51421878090 has 384 divisors, whose sum is σ = 161190881280. Its totient is φ = 11238796800.

The previous prime is 51421878083. The next prime is 51421878121. The reversal of 51421878090 is 9087812415.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 28393285 + ... + 28395095.

It is an arithmetic number, because the mean of its divisors is an integer number (419767920).

Almost surely, 2^51421878090 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51421878090, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (80595440640).

51421878090 is an abundant number, since it is smaller than the sum of its proper divisors (109769003190).

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

51421878090 is a wasteful number, since it uses less digits than its factorization.

51421878090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1930 (or 1927 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 45.

The spelling of 51421878090 in words is "fifty-one billion, four hundred twenty-one million, eight hundred seventy-eight thousand, ninety".