626428019 has 24 divisors (see below), whose sum is σ = 781155360. Its totient is φ = 491636736.

The previous prime is 626428009. The next prime is 626428063. The reversal of 626428019 is 910824626.

It is a de Polignac number, because none of the positive numbers 2^k-626428019 is a prime.

It is a super-2 number, since 2×626428019² = 784824125976528722, 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 (626428009) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 70667 + ... + 79035.

It is an arithmetic number, because the mean of its divisors is an integer number (32548140).

Almost surely, 2^626428019 is an apocalyptic number.

626428019 is a deficient number, since it is larger than the sum of its proper divisors (154727341).

626428019 is a wasteful number, since it uses less digits than its factorization.

626428019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8447 (or 8430 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 38.

The square root of 626428019 is about 25028.5440847046. The cubic root of 626428019 is about 855.6386455355.

The spelling of 626428019 in words is "six hundred twenty-six million, four hundred twenty-eight thousand, nineteen".