620644555 has 16 divisors (see below), whose sum is σ = 752615424. Its totient is φ = 491309280.

The previous prime is 620644553. The next prime is 620644567. The reversal of 620644555 is 555446026.

It is not a de Polignac number, because 620644555 - 2¹ = 620644553 is a prime.

It is a super-2 number, since 2×620644555² = 770399327302296050, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (620644553) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 292950 + ... + 295060.

It is an arithmetic number, because the mean of its divisors is an integer number (47038464).

Almost surely, 2^620644555 is an apocalyptic number.

620644555 is a deficient number, since it is larger than the sum of its proper divisors (131970869).

620644555 is a wasteful number, since it uses less digits than its factorization.

620644555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2706.

The product of its (nonzero) digits is 144000, while the sum is 37.

The square root of 620644555 is about 24912.7388096933. The cubic root of 620644555 is about 852.9972869958.

The spelling of 620644555 in words is "six hundred twenty million, six hundred forty-four thousand, five hundred fifty-five".