51340864 has 28 divisors (see below), whose sum is σ = 102490524. Its totient is φ = 25516544.

The previous prime is 51340859. The next prime is 51340871. The reversal of 51340864 is 46804315.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 31270464 + 20070400 = 5592^2 + 4480^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8754 + ... + 13390.

Almost surely, 2^51340864 is an apocalyptic number.

It is an amenable number.

51340864 is a deficient number, since it is larger than the sum of its proper divisors (51149660).

51340864 is a wasteful number, since it uses less digits than its factorization.

51340864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4822 (or 4812 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 31.

The square root of 51340864 is about 7165.2539382774. The cubic root of 51340864 is about 371.6673327646.

The spelling of 51340864 in words is "fifty-one million, three hundred forty thousand, eight hundred sixty-four".