51986478 has 8 divisors (see below), whose sum is σ = 103972968. Its totient is φ = 17328824.

The previous prime is 51986461. The next prime is 51986479. The reversal of 51986478 is 87468915.

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

51986478 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51986479) 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, 4332201 + ... + 4332212.

It is an arithmetic number, because the mean of its divisors is an integer number (12996621).

Almost surely, 2^51986478 is an apocalyptic number.

51986478 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.

51986478 is a wasteful number, since it uses less digits than its factorization.

51986478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8664418.

The product of its digits is 483840, while the sum is 48.

The square root of 51986478 is about 7210.1649079615. The cubic root of 51986478 is about 373.2187596617.

The spelling of 51986478 in words is "fifty-one million, nine hundred eighty-six thousand, four hundred seventy-eight".