51340464 has 180 divisors, whose sum is σ = 172877328. Its totient is φ = 13927680.

The previous prime is 51340463. The next prime is 51340481. The reversal of 51340464 is 46404315.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51340463) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 968662 + ... + 968714.

Almost surely, 2^51340464 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 51340464, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (86438664).

51340464 is an abundant number, since it is smaller than the sum of its proper divisors (121536864).

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

51340464 is a wasteful number, since it uses less digits than its factorization.

51340464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136 (or 96 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

The square root of 51340464 is about 7165.2260257441. The cubic root of 51340464 is about 371.6663675340. Note that the first 3 decimals are identical.

Adding to 51340464 its reverse (46404315), we get a palindrome (97744779).

The spelling of 51340464 in words is "fifty-one million, three hundred forty thousand, four hundred sixty-four".