620556353 has 4 divisors (see below), whose sum is σ = 647537088. Its totient is φ = 593575620.

The previous prime is 620556329. The next prime is 620556367. The reversal of 620556353 is 353655026.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 353655026 = 2 ⋅176827513.

It is a cyclic number.

It is not a de Polignac number, because 620556353 - 2⁶ = 620556289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (620556323) 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, 13490333 + ... + 13490378.

It is an arithmetic number, because the mean of its divisors is an integer number (161884272).

Almost surely, 2^620556353 is an apocalyptic number.

It is an amenable number.

620556353 is a deficient number, since it is larger than the sum of its proper divisors (26980735).

620556353 is a wasteful number, since it uses less digits than its factorization.

620556353 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26980734.

The product of its (nonzero) digits is 81000, while the sum is 35.

The square root of 620556353 is about 24910.9685279397. The cubic root of 620556353 is about 852.9568775911.

The spelling of 620556353 in words is "six hundred twenty million, five hundred fifty-six thousand, three hundred fifty-three".