620653813 has 16 divisors (see below), whose sum is σ = 682286976. Its totient is φ = 561113280.

The previous prime is 620653793. The next prime is 620653879. The reversal of 620653813 is 318356026.

It is a de Polignac number, because none of the positive numbers 2^k-620653813 is a prime.

It is a super-2 number, since 2×620653813² = 770422311182877938, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (620053813) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 142770 + ... + 147052.

It is an arithmetic number, because the mean of its divisors is an integer number (42642936).

Almost surely, 2^620653813 is an apocalyptic number.

It is an amenable number.

620653813 is a deficient number, since it is larger than the sum of its proper divisors (61633163).

620653813 is a wasteful number, since it uses less digits than its factorization.

620653813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4524.

The product of its (nonzero) digits is 25920, while the sum is 34.

The square root of 620653813 is about 24912.9246175554. The cubic root of 620653813 is about 853.0015282906.

The spelling of 620653813 in words is "six hundred twenty million, six hundred fifty-three thousand, eight hundred thirteen".