620635640 has 16 divisors (see below), whose sum is σ = 1396430280. Its totient is φ = 248254240.

The previous prime is 620635567. The next prime is 620635649. The reversal of 620635640 is 46536026.

It is a junction number, because it is equal to n+sod(n) for n = 620635597 and 620635606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (620635649) 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 3 ways as a sum of consecutive naturals, for example, 7757906 + ... + 7757985.

Almost surely, 2^620635640 is an apocalyptic number.

It is an amenable number.

620635640 is an abundant number, since it is smaller than the sum of its proper divisors (775794640).

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

620635640 is a wasteful number, since it uses less digits than its factorization.

620635640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15515902 (or 15515898 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 32.

The square root of 620635640 is about 24912.5598845241. The cubic root of 620635640 is about 852.9932027970.

The spelling of 620635640 in words is "six hundred twenty million, six hundred thirty-five thousand, six hundred forty".