621340623 has 12 divisors (see below), whose sum is σ = 912704520. Its totient is φ = 407205936.

The previous prime is 621340613. The next prime is 621340637. The reversal of 621340623 is 326043126.

621340623 is a `hidden beast` number, since 6 + 2 + 1 + 34 + 0 + 623 = 666.

It is not a de Polignac number, because 621340623 - 2¹⁶ = 621275087 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621340613) 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, 584536 + ... + 585597.

It is an arithmetic number, because the mean of its divisors is an integer number (76058710).

Almost surely, 2^621340623 is an apocalyptic number.

621340623 is a deficient number, since it is larger than the sum of its proper divisors (291363897).

621340623 is a wasteful number, since it uses less digits than its factorization.

621340623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1170198 (or 1170195 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 27.

The square root of 621340623 is about 24926.7050169091. The cubic root of 621340623 is about 853.3160536086.

Adding to 621340623 its reverse (326043126), we get a palindrome (947383749).

The spelling of 621340623 in words is "six hundred twenty-one million, three hundred forty thousand, six hundred twenty-three".