51878515 has 8 divisors (see below), whose sum is σ = 67043088. Its totient is φ = 38310240.

The previous prime is 51878507. The next prime is 51878521. The reversal of 51878515 is 51587815.

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

It is not a de Polignac number, because 51878515 - 2³ = 51878507 is a prime.

It is a Duffinian number.

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, 399001 + ... + 399130.

It is an arithmetic number, because the mean of its divisors is an integer number (8380386).

Almost surely, 2^51878515 is an apocalyptic number.

51878515 is a deficient number, since it is larger than the sum of its proper divisors (15164573).

51878515 is a wasteful number, since it uses less digits than its factorization.

51878515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 798149.

The product of its digits is 56000, while the sum is 40.

The square root of 51878515 is about 7202.6741561728. The cubic root of 51878515 is about 372.9602197224.

The spelling of 51878515 in words is "fifty-one million, eight hundred seventy-eight thousand, five hundred fifteen".