628243581 has 8 divisors (see below), whose sum is σ = 957323584. Its totient is φ = 358996320.

The previous prime is 628243549. The next prime is 628243601. The reversal of 628243581 is 185342826.

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

It is not a de Polignac number, because 628243581 - 2⁵ = 628243549 is a prime.

It is a super-2 number, since 2×628243581² = 789379994135407122, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (628243541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14958160 + ... + 14958201.

It is an arithmetic number, because the mean of its divisors is an integer number (119665448).

Almost surely, 2^628243581 is an apocalyptic number.

It is an amenable number.

628243581 is a deficient number, since it is larger than the sum of its proper divisors (329080003).

628243581 is a wasteful number, since it uses less digits than its factorization.

628243581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29916371.

The product of its digits is 92160, while the sum is 39.

The square root of 628243581 is about 25064.7876711533. The cubic root of 628243581 is about 856.4644741940.

The spelling of 628243581 in words is "six hundred twenty-eight million, two hundred forty-three thousand, five hundred eighty-one".