51706487 has 4 divisors (see below), whose sum is σ = 59093136. Its totient is φ = 44319840.

The previous prime is 51706441. The next prime is 51706489. The reversal of 51706487 is 78460715.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 51706487 - 2⁶ = 51706423 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51706487.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51706489) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3693314 + ... + 3693327.

It is an arithmetic number, because the mean of its divisors is an integer number (14773284).

Almost surely, 2^51706487 is an apocalyptic number.

51706487 is a deficient number, since it is larger than the sum of its proper divisors (7386649).

51706487 is an equidigital number, since it uses as much as digits as its factorization.

51706487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7386648.

The product of its (nonzero) digits is 47040, while the sum is 38.

The square root of 51706487 is about 7190.7222863910. The cubic root of 51706487 is about 372.5475206254.

The spelling of 51706487 in words is "fifty-one million, seven hundred six thousand, four hundred eighty-seven".