51320687 has 8 divisors (see below), whose sum is σ = 56080512. Its totient is φ = 46576600.

The previous prime is 51320683. The next prime is 51320699. The reversal of 51320687 is 78602315.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 51320687 - 2² = 51320683 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51320683) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3512 + ... + 10722.

It is an arithmetic number, because the mean of its divisors is an integer number (7010064).

Almost surely, 2^51320687 is an apocalyptic number.

51320687 is a deficient number, since it is larger than the sum of its proper divisors (4759825).

51320687 is a wasteful number, since it uses less digits than its factorization.

51320687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7869.

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 51320687 is about 7163.8458246950. The cubic root of 51320687 is about 371.6186378668.

The spelling of 51320687 in words is "fifty-one million, three hundred twenty thousand, six hundred eighty-seven".