51340680 has 96 divisors (see below), whose sum is σ = 176693400. Its totient is φ = 12883968.

The previous prime is 51340661. The next prime is 51340687. The reversal of 51340680 is 8604315.

It can be written as a sum of positive squares in 4 ways, for example, as 50722884 + 617796 = 7122^2 + 786^2 .

It is not an unprimeable number, because it can be changed into a prime (51340687) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1926 + ... + 10314.

Almost surely, 2^51340680 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 51340680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (88346700).

51340680 is an abundant number, since it is smaller than the sum of its proper divisors (125352720).

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

51340680 is a wasteful number, since it uses less digits than its factorization.

51340680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8423 (or 8416 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 51340680 is about 7165.2410985256. The cubic root of 51340680 is about 371.6668887592. Note that the first 3 decimals are identical.

Adding to 51340680 its reverse (8604315), we get a palindrome (59944995).

The spelling of 51340680 in words is "fifty-one million, three hundred forty thousand, six hundred eighty".