520772639 has 4 divisors (see below), whose sum is σ = 520935120. Its totient is φ = 520610160.

The previous prime is 520772599. The next prime is 520772641. The reversal of 520772639 is 936277025.

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

It is a cyclic number.

It is not a de Polignac number, because 520772639 - 2¹² = 520768543 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 520772596 and 520772605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (520772839) 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, 76334 + ... + 82875.

It is an arithmetic number, because the mean of its divisors is an integer number (130233780).

Almost surely, 2^520772639 is an apocalyptic number.

520772639 is a deficient number, since it is larger than the sum of its proper divisors (162481).

520772639 is a wasteful number, since it uses less digits than its factorization.

520772639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162480.

The product of its (nonzero) digits is 158760, while the sum is 41.

The square root of 520772639 is about 22820.4434444206. The cubic root of 520772639 is about 804.5432327655.

The spelling of 520772639 in words is "five hundred twenty million, seven hundred seventy-two thousand, six hundred thirty-nine".