51220478 has 8 divisors (see below), whose sum is σ = 76875480. Its totient is φ = 25595320.

The previous prime is 51220457. The next prime is 51220487. The reversal of 51220478 is 87402215.

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

It is a self number, because there is not a number n which added to its sum of digits gives 51220478.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2513 + ... + 10428.

It is an arithmetic number, because the mean of its divisors is an integer number (9609435).

Almost surely, 2^51220478 is an apocalyptic number.

51220478 is a deficient number, since it is larger than the sum of its proper divisors (25655002).

51220478 is a wasteful number, since it uses less digits than its factorization.

51220478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14922.

The product of its (nonzero) digits is 4480, while the sum is 29.

The square root of 51220478 is about 7156.8483286989. The cubic root of 51220478 is about 371.3766055363.

The spelling of 51220478 in words is "fifty-one million, two hundred twenty thousand, four hundred seventy-eight".