620646140 has 24 divisors (see below), whose sum is σ = 1338584352. Its totient is φ = 241548480.

The previous prime is 620646137. The next prime is 620646157. The reversal of 620646140 is 41646026.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 418616 + ... + 420095.

It is an arithmetic number, because the mean of its divisors is an integer number (55774348).

Almost surely, 2^620646140 is an apocalyptic number.

It is an amenable number.

620646140 is an abundant number, since it is smaller than the sum of its proper divisors (717938212).

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

620646140 is a wasteful number, since it uses less digits than its factorization.

620646140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 838757 (or 838755 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 29.

The square root of 620646140 is about 24912.7706207078. The cubic root of 620646140 is about 852.9980131224.

The spelling of 620646140 in words is "six hundred twenty million, six hundred forty-six thousand, one hundred forty".