51207660 has 384 divisors, whose sum is σ = 206438400. Its totient is φ = 10264320.

The previous prime is 51207659. The next prime is 51207661. The reversal of 51207660 is 6670215.

It is an interprime number because it is at equal distance from previous prime (51207659) and next prime (51207661).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (51207661) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 1651845 + ... + 1651875.

It is an arithmetic number, because the mean of its divisors is an integer number (537600).

Almost surely, 2^51207660 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 51207660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (103219200).

51207660 is an abundant number, since it is smaller than the sum of its proper divisors (155230740).

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

51207660 is a wasteful number, since it uses less digits than its factorization.

51207660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98 (or 90 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 27.

The square root of 51207660 is about 7155.9527667530. The cubic root of 51207660 is about 371.3456237711.

Adding to 51207660 its reverse (6670215), we get a palindrome (57877875).

The spelling of 51207660 in words is "fifty-one million, two hundred seven thousand, six hundred sixty".