621877638 has 16 divisors (see below), whose sum is σ = 1309216320. Its totient is φ = 196382376.

The previous prime is 621877579. The next prime is 621877679. The reversal of 621877638 is 836778126.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2727420 + ... + 2727647.

It is an arithmetic number, because the mean of its divisors is an integer number (81826020).

Almost surely, 2^621877638 is an apocalyptic number.

621877638 is an abundant number, since it is smaller than the sum of its proper divisors (687338682).

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

621877638 is a wasteful number, since it uses less digits than its factorization.

621877638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5455091.

The product of its digits is 677376, while the sum is 48.

The square root of 621877638 is about 24937.4745714156. The cubic root of 621877638 is about 853.5618187328.

The spelling of 621877638 in words is "six hundred twenty-one million, eight hundred seventy-seven thousand, six hundred thirty-eight".