51520000 has 200 divisors, whose sum is σ = 153400896. Its totient is φ = 16896000.

The previous prime is 51519991. The next prime is 51520003. The reversal of 51520000 is 2515.

It is a tau number, because it is divible by the number of its divisors (200).

It is not an unprimeable number, because it can be changed into a prime (51520003) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 2239989 + ... + 2240011.

Almost surely, 2^51520000 is an apocalyptic number.

51520000 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 51520000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (76700448).

51520000 is an abundant number, since it is smaller than the sum of its proper divisors (101880896).

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

51520000 is an frugal number, since it uses more digits than its factorization.

51520000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68 (or 37 counting only the distinct ones).

The product of its (nonzero) digits is 50, while the sum is 13.

The square root of 51520000 is about 7177.7433779705. The cubic root of 51520000 is about 372.0990987380.

Adding to 51520000 its reverse (2515), we get a palindrome (51522515).

The spelling of 51520000 in words is "fifty-one million, five hundred twenty thousand".