621954649 has 8 divisors (see below), whose sum is σ = 625252680. Its totient is φ = 618663936.

The previous prime is 621954559. The next prime is 621954679. The reversal of 621954649 is 946459126.

It can be written as a sum of positive squares in 4 ways, for example, as 26594649 + 595360000 = 5157^2 + 24400^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 621954649 - 2⁷ = 621954521 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 621954599 and 621954608.

It is not an unprimeable number, because it can be changed into a prime (621954679) 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, 259147 + ... + 261535.

It is an arithmetic number, because the mean of its divisors is an integer number (78156585).

Almost surely, 2^621954649 is an apocalyptic number.

It is an amenable number.

621954649 is a deficient number, since it is larger than the sum of its proper divisors (3298031).

621954649 is a wasteful number, since it uses less digits than its factorization.

621954649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3659.

The product of its digits is 466560, while the sum is 46.

The square root of 621954649 is about 24939.0186053902. The cubic root of 621954649 is about 853.5970512459.

The spelling of 621954649 in words is "six hundred twenty-one million, nine hundred fifty-four thousand, six hundred forty-nine".