51720294 has 8 divisors (see below), whose sum is σ = 103440600. Its totient is φ = 17240096.

The previous prime is 51720293. The next prime is 51720301. The reversal of 51720294 is 49202715.

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

51720294 is an admirable number.

It is a super-2 number, since 2×51720294² = 5349977622892872, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51720293) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4310019 + ... + 4310030.

It is an arithmetic number, because the mean of its divisors is an integer number (12930075).

Almost surely, 2^51720294 is an apocalyptic number.

51720294 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.

51720294 is a wasteful number, since it uses less digits than its factorization.

51720294 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8620054.

The product of its (nonzero) digits is 5040, while the sum is 30.

The square root of 51720294 is about 7191.6822788552. The cubic root of 51720294 is about 372.5806776891.

The spelling of 51720294 in words is "fifty-one million, seven hundred twenty thousand, two hundred ninety-four".