620521842 has 16 divisors (see below), whose sum is σ = 1241809920. Its totient is φ = 206712912.

The previous prime is 620521841. The next prime is 620521859. The reversal of 620521842 is 248125026.

It is not an unprimeable number, because it can be changed into a prime (620521841) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21117 + ... + 41072.

It is an arithmetic number, because the mean of its divisors is an integer number (77613120).

Almost surely, 2^620521842 is an apocalyptic number.

620521842 is an abundant number, since it is smaller than the sum of its proper divisors (621288078).

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

620521842 is a wasteful number, since it uses less digits than its factorization.

620521842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63857.

The product of its (nonzero) digits is 7680, while the sum is 30.

The square root of 620521842 is about 24910.2758314716. The cubic root of 620521842 is about 852.9410654679.

Adding to 620521842 its reverse (248125026), we get a palindrome (868646868).

The spelling of 620521842 in words is "six hundred twenty million, five hundred twenty-one thousand, eight hundred forty-two".