51667986 has 8 divisors (see below), whose sum is σ = 103335984. Its totient is φ = 17222660.

The previous prime is 51667969. The next prime is 51668003. The reversal of 51667986 is 68976615.

It is an interprime number because it is at equal distance from previous prime (51667969) and next prime (51668003).

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

51667986 is an admirable number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4305660 + ... + 4305671.

It is an arithmetic number, because the mean of its divisors is an integer number (12916998).

Almost surely, 2^51667986 is an apocalyptic number.

51667986 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

51667986 is a wasteful number, since it uses less digits than its factorization.

51667986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8611336.

The product of its digits is 544320, while the sum is 48.

The square root of 51667986 is about 7188.0446576242. The cubic root of 51667986 is about 372.4550305307.

The spelling of 51667986 in words is "fifty-one million, six hundred sixty-seven thousand, nine hundred eighty-six".