621621740 has 24 divisors (see below), whose sum is σ = 1307815152. Its totient is φ = 248189760.

The previous prime is 621621733. The next prime is 621621751. The reversal of 621621740 is 47126126.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17471 + ... + 39350.

It is an arithmetic number, because the mean of its divisors is an integer number (54492298).

Almost surely, 2^621621740 is an apocalyptic number.

It is an amenable number.

621621740 is an abundant number, since it is smaller than the sum of its proper divisors (686193412).

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

621621740 is a wasteful number, since it uses less digits than its factorization.

621621740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57377 (or 57375 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 621621740 is about 24932.3432512871. The cubic root of 621621740 is about 853.4447245673. Note that the first 3 decimals are identical.

Adding to 621621740 its reverse (47126126), we get a palindrome (668747866).

The spelling of 621621740 in words is "six hundred twenty-one million, six hundred twenty-one thousand, seven hundred forty".