51212560 has 80 divisors (see below), whose sum is σ = 137491200. Its totient is φ = 17376768.

The previous prime is 51212549. The next prime is 51212561. The reversal of 51212560 is 6521215.

It is a tau number, because it is divible by the number of its divisors (80).

It is not an unprimeable number, because it can be changed into a prime (51212561) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 60621 + ... + 61459.

It is an arithmetic number, because the mean of its divisors is an integer number (1718640).

Almost surely, 2^51212560 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51212560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (68745600).

51212560 is an abundant number, since it is smaller than the sum of its proper divisors (86278640).

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

51212560 is a wasteful number, since it uses less digits than its factorization.

51212560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 968 (or 962 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 22.

The square root of 51212560 is about 7156.2951308621. The cubic root of 51212560 is about 371.3574679334.

Adding to 51212560 its reverse (6521215), we get a palindrome (57733775).

It can be divided in two parts, 5121 and 2560, that multiplied together give a triangular number (13109760 = T₅₁₂₀).

The spelling of 51212560 in words is "fifty-one million, two hundred twelve thousand, five hundred sixty".