51520475400 has 192 divisors, whose sum is σ = 169695388800. Its totient is φ = 12885749760.

The previous prime is 51520475399. The next prime is 51520475431. The reversal of 51520475400 is 457402515.

51520475400 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2979981 + ... + 2997219.

It is an arithmetic number, because the mean of its divisors is an integer number (883830150).

Almost surely, 2^51520475400 is an apocalyptic number.

51520475400 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51520475400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (84847694400).

51520475400 is an abundant number, since it is smaller than the sum of its proper divisors (118174913400).

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

51520475400 is a wasteful number, since it uses less digits than its factorization.

51520475400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17568 (or 17559 counting only the distinct ones).

The product of its (nonzero) digits is 28000, while the sum is 33.

Adding to 51520475400 its reverse (457402515), we get a palindrome (51977877915).

The spelling of 51520475400 in words is "fifty-one billion, five hundred twenty million, four hundred seventy-five thousand, four hundred".