620521388 has 24 divisors (see below), whose sum is σ = 1113542640. Its totient is φ = 302382080.

The previous prime is 620521357. The next prime is 620521427. The reversal of 620521388 is 883125026.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 308795 + ... + 310797.

It is an arithmetic number, because the mean of its divisors is an integer number (46397610).

Almost surely, 2^620521388 is an apocalyptic number.

It is an amenable number.

620521388 is a deficient number, since it is larger than the sum of its proper divisors (493021252).

620521388 is a wasteful number, since it uses less digits than its factorization.

620521388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3937 (or 3935 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 35.

The square root of 620521388 is about 24910.2667187648. The cubic root of 620521388 is about 852.9408574519.

The spelling of 620521388 in words is "six hundred twenty million, five hundred twenty-one thousand, three hundred eighty-eight".