51378087 has 8 divisors (see below), whose sum is σ = 69210736. Its totient is φ = 33898752.

The previous prime is 51378023. The next prime is 51378101. The reversal of 51378087 is 78087315.

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

It is not a de Polignac number, because 51378087 - 2⁶ = 51378023 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 (51378017) 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, 87988 + ... + 88569.

It is an arithmetic number, because the mean of its divisors is an integer number (8651342).

Almost surely, 2^51378087 is an apocalyptic number.

51378087 is a deficient number, since it is larger than the sum of its proper divisors (17832649).

51378087 is a wasteful number, since it uses less digits than its factorization.

51378087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176657.

The product of its (nonzero) digits is 47040, while the sum is 39.

The square root of 51378087 is about 7167.8509331598. The cubic root of 51378087 is about 371.7571327794.

The spelling of 51378087 in words is "fifty-one million, three hundred seventy-eight thousand, eighty-seven".