51380560 has 160 divisors (see below), whose sum is σ = 157132800. Its totient is φ = 15137280.

The previous prime is 51380557. The next prime is 51380587. The reversal of 51380560 is 6508315.

51380560 = 156² + 157² + ... + 540².

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 116821 + ... + 117259.

It is an arithmetic number, because the mean of its divisors is an integer number (982080).

Almost surely, 2^51380560 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 51380560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (78566400).

51380560 is an abundant number, since it is smaller than the sum of its proper divisors (105752240).

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

51380560 is a wasteful number, since it uses less digits than its factorization.

51380560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 489 (or 483 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 28.

The square root of 51380560 is about 7168.0234374617. The cubic root of 51380560 is about 371.7630973238.

Adding to 51380560 its reverse (6508315), we get a palindrome (57888875).

The spelling of 51380560 in words is "fifty-one million, three hundred eighty thousand, five hundred sixty".