620651107044 has 18 divisors (see below), whose sum is σ = 1568868076230. Its totient is φ = 206883702336.

The previous prime is 620651106949. The next prime is 620651107073. The reversal of 620651107044 is 440701156026.

It can be written as a sum of positive squares in only one way, i.e., 440842881600 + 179808225444 = 663960^2 + 424038^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-3 number, since 3×620651107044³ (a number of 36 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 17240308529 = 620651107044 / (6 + 2 + 0 + 6 + 5 + 1 + 1 + 0 + 7 + 0 + 4 + 4).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8620154229 + ... + 8620154300.

Almost surely, 2^620651107044 is an apocalyptic number.

It is an amenable number.

620651107044 is an abundant number, since it is smaller than the sum of its proper divisors (948216969186).

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

620651107044 is a wasteful number, since it uses less digits than its factorization.

620651107044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17240308539 (or 17240308534 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 36.

The spelling of 620651107044 in words is "six hundred twenty billion, six hundred fifty-one million, one hundred seven thousand, forty-four".