52720391 has 4 divisors (see below), whose sum is σ = 52734984. Its totient is φ = 52705800.

The previous prime is 52720387. The next prime is 52720399. The reversal of 52720391 is 19302725.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 52720391 - 2² = 52720387 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (52720399) 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, 2576 + ... + 10586.

It is an arithmetic number, because the mean of its divisors is an integer number (13183746).

Almost surely, 2^52720391 is an apocalyptic number.

52720391 is a deficient number, since it is larger than the sum of its proper divisors (14593).

52720391 is an equidigital number, since it uses as much as digits as its factorization.

52720391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14592.

The product of its (nonzero) digits is 3780, while the sum is 29.

The square root of 52720391 is about 7260.8808694262. The cubic root of 52720391 is about 374.9668498103.

The spelling of 52720391 in words is "fifty-two million, seven hundred twenty thousand, three hundred ninety-one".