620461645 has 8 divisors (see below), whose sum is σ = 749297304. Its totient is φ = 493207104.

The previous prime is 620461637. The next prime is 620461657. The reversal of 620461645 is 546164026.

It can be written as a sum of positive squares in 4 ways, for example, as 3364 + 620458281 = 58^2 + 24909^2 .

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 620461645 - 2³ = 620461637 is a prime.

It is a super-3 number, since 3×620461645³ (a number of 27 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

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 620461645.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 394414 + ... + 395983.

It is an arithmetic number, because the mean of its divisors is an integer number (93662163).

Almost surely, 2^620461645 is an apocalyptic number.

It is an amenable number.

620461645 is a deficient number, since it is larger than the sum of its proper divisors (128835659).

620461645 is a wasteful number, since it uses less digits than its factorization.

620461645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 790559.

The product of its (nonzero) digits is 34560, while the sum is 34.

The square root of 620461645 is about 24909.0675257024. The cubic root of 620461645 is about 852.9134832243.

The spelling of 620461645 in words is "six hundred twenty million, four hundred sixty-one thousand, six hundred forty-five".