52780513 has 4 divisors (see below), whose sum is σ = 53324740. Its totient is φ = 52236288.

The previous prime is 52780487. The next prime is 52780543. The reversal of 52780513 is 31508725.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 20142144 + 32638369 = 4488^2 + 5713^2 .

It is a cyclic number.

It is not a de Polignac number, because 52780513 - 2⁹ = 52780001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (52780543) 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, 271968 + ... + 272161.

It is an arithmetic number, because the mean of its divisors is an integer number (13331185).

Almost surely, 2^52780513 is an apocalyptic number.

It is an amenable number.

52780513 is a deficient number, since it is larger than the sum of its proper divisors (544227).

52780513 is an equidigital number, since it uses as much as digits as its factorization.

52780513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 544226.

The product of its (nonzero) digits is 8400, while the sum is 31.

The square root of 52780513 is about 7265.0198210328. The cubic root of 52780513 is about 375.1093322689.

The spelling of 52780513 in words is "fifty-two million, seven hundred eighty thousand, five hundred thirteen".