51720443 has 8 divisors (see below), whose sum is σ = 56037168. Its totient is φ = 47545344.

The previous prime is 51720419. The next prime is 51720457. The reversal of 51720443 is 34402715.

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

It is a cyclic number.

It is not a de Polignac number, because 51720443 - 2⁶ = 51720379 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51720463) 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, 34646 + ... + 36107.

It is an arithmetic number, because the mean of its divisors is an integer number (7004646).

Almost surely, 2^51720443 is an apocalyptic number.

51720443 is a deficient number, since it is larger than the sum of its proper divisors (4316725).

51720443 is a wasteful number, since it uses less digits than its factorization.

51720443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70813.

The product of its (nonzero) digits is 3360, while the sum is 26.

The square root of 51720443 is about 7191.6926380373. The cubic root of 51720443 is about 372.5810354756.

The spelling of 51720443 in words is "fifty-one million, seven hundred twenty thousand, four hundred forty-three".