626538420 has 36 divisors (see below), whose sum is σ = 1900500420. Its totient is φ = 167076864.

The previous prime is 626538413. The next prime is 626538421. The reversal of 626538420 is 24835626.

626538420 is a `hidden beast` number, since 626 + 5 + 3 + 8 + 4 + 20 = 666.

626538420 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 473323536 + 153214884 = 21756^2 + 12378^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (626538421) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1740205 + ... + 1740564.

Almost surely, 2^626538420 is an apocalyptic number.

626538420 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

626538420 is an abundant number, since it is smaller than the sum of its proper divisors (1273962000).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

626538420 is a wasteful number, since it uses less digits than its factorization.

626538420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3480784 (or 3480779 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 36.

The square root of 626538420 is about 25030.7494893781. The cubic root of 626538420 is about 855.6889081943.

The spelling of 626538420 in words is "six hundred twenty-six million, five hundred thirty-eight thousand, four hundred twenty".