51687786 has 16 divisors (see below), whose sum is σ = 109456704. Its totient is φ = 16215744.

The previous prime is 51687761. The next prime is 51687791. The reversal of 51687786 is 68778615.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 253270 + ... + 253473.

It is an arithmetic number, because the mean of its divisors is an integer number (6841044).

Almost surely, 2^51687786 is an apocalyptic number.

51687786 is an abundant number, since it is smaller than the sum of its proper divisors (57768918).

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

51687786 is a wasteful number, since it uses less digits than its factorization.

51687786 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 506765.

The product of its digits is 564480, while the sum is 48.

The square root of 51687786 is about 7189.4218126356. The cubic root of 51687786 is about 372.5026013662.

The spelling of 51687786 in words is "fifty-one million, six hundred eighty-seven thousand, seven hundred eighty-six".