621140258 has 6 divisors (see below), whose sum is σ = 931763259. Its totient is φ = 310552506.

The previous prime is 621140257. The next prime is 621140269. The reversal of 621140258 is 852041126.

It can be written as a sum of positive squares in only one way, i.e., 310570129 + 310570129 = 17623^2 + 17623^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=17623.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 621140258.

It is not an unprimeable number, because it can be changed into a prime (621140251) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 26435 + ... + 44057.

Almost surely, 2^621140258 is an apocalyptic number.

621140258 is a deficient number, since it is larger than the sum of its proper divisors (310623001).

621140258 is an frugal number, since it uses more digits than its factorization.

621140258 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35248 (or 17625 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 29.

The square root of 621140258 is about 24922.6856097011. The cubic root of 621140258 is about 853.2243202145.

The spelling of 621140258 in words is "six hundred twenty-one million, one hundred forty thousand, two hundred fifty-eight".