51307480 has 128 divisors (see below), whose sum is σ = 142663680. Its totient is φ = 16220160.

The previous prime is 51307453. The next prime is 51307489. The reversal of 51307480 is 8470315.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51307489) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 199512 + ... + 199768.

It is an arithmetic number, because the mean of its divisors is an integer number (1114560).

Almost surely, 2^51307480 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 51307480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (71331840).

51307480 is an abundant number, since it is smaller than the sum of its proper divisors (91356200).

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

51307480 is a wasteful number, since it uses less digits than its factorization.

51307480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 329 (or 325 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 51307480 is about 7162.9239839607. The cubic root of 51307480 is about 371.5867573608.

Adding to 51307480 its reverse (8470315), we get a palindrome (59777795).

The spelling of 51307480 in words is "fifty-one million, three hundred seven thousand, four hundred eighty".