51215578 has 8 divisors (see below), whose sum is σ = 77295168. Its totient is φ = 25450524.

The previous prime is 51215573. The next prime is 51215581. The reversal of 51215578 is 87551215.

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

It is not an unprimeable number, because it can be changed into a prime (51215573) 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, 78226 + ... + 78877.

It is an arithmetic number, because the mean of its divisors is an integer number (9661896).

Almost surely, 2^51215578 is an apocalyptic number.

51215578 is a deficient number, since it is larger than the sum of its proper divisors (26079590).

51215578 is a wasteful number, since it uses less digits than its factorization.

51215578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157268.

The product of its digits is 14000, while the sum is 34.

The square root of 51215578 is about 7156.5059910546. The cubic root of 51215578 is about 371.3647625946.

The spelling of 51215578 in words is "fifty-one million, two hundred fifteen thousand, five hundred seventy-eight".