621207677 has 4 divisors (see below), whose sum is σ = 626906940. Its totient is φ = 615508416.

The previous prime is 621207623. The next prime is 621207683. The reversal of 621207677 is 776702126.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 776702126 = 2 ⋅388351063.

It can be written as a sum of positive squares in 2 ways, for example, as 333939076 + 287268601 = 18274^2 + 16949^2 .

It is a cyclic number.

It is not a de Polignac number, because 621207677 - 2¹⁴ = 621191293 is a prime.

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 621207677.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621207877) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2849468 + ... + 2849685.

It is an arithmetic number, because the mean of its divisors is an integer number (156726735).

Almost surely, 2^621207677 is an apocalyptic number.

It is an amenable number.

621207677 is a deficient number, since it is larger than the sum of its proper divisors (5699263).

621207677 is a wasteful number, since it uses less digits than its factorization.

621207677 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5699262.

The product of its (nonzero) digits is 49392, while the sum is 38.

The square root of 621207677 is about 24924.0381359041. The cubic root of 621207677 is about 853.2551889535.

The spelling of 621207677 in words is "six hundred twenty-one million, two hundred seven thousand, six hundred seventy-seven".