520025645 has 8 divisors (see below), whose sum is σ = 628219800. Its totient is φ = 413227840.

The previous prime is 520025621. The next prime is 520025657. The reversal of 520025645 is 546520025.

It can be written as a sum of positive squares in 4 ways, for example, as 11162281 + 508863364 = 3341^2 + 22558^2 .

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

It is not a de Polignac number, because 520025645 - 2²⁸ = 251590189 is a prime.

It is a super-3 number, since 3×520025645³ (a number of 27 digits) contains 333 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 348266 + ... + 349755.

It is an arithmetic number, because the mean of its divisors is an integer number (78527475).

Almost surely, 2^520025645 is an apocalyptic number.

It is an amenable number.

520025645 is a deficient number, since it is larger than the sum of its proper divisors (108194155).

520025645 is a wasteful number, since it uses less digits than its factorization.

520025645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 698175.

The product of its (nonzero) digits is 12000, while the sum is 29.

The square root of 520025645 is about 22804.0707988727. The cubic root of 520025645 is about 804.1583709251.

The spelling of 520025645 in words is "five hundred twenty million, twenty-five thousand, six hundred forty-five".