644058253 has 8 divisors (see below), whose sum is σ = 653685120. Its totient is φ = 634446960.

The previous prime is 644058251. The next prime is 644058269. The reversal of 644058253 is 352850446.

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 644058253 - 2¹ = 644058251 is a prime.

It is a super-2 number, since 2×644058253² = 829622066514824018, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (644058251) 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, 99603 + ... + 105871.

It is an arithmetic number, because the mean of its divisors is an integer number (81710640).

Almost surely, 2^644058253 is an apocalyptic number.

It is an amenable number.

644058253 is a deficient number, since it is larger than the sum of its proper divisors (9626867).

644058253 is a wasteful number, since it uses less digits than its factorization.

644058253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7787.

The product of its (nonzero) digits is 115200, while the sum is 37.

The square root of 644058253 is about 25378.3027998328. The cubic root of 644058253 is about 863.5915479953.

The spelling of 644058253 in words is "six hundred forty-four million, fifty-eight thousand, two hundred fifty-three".