620644554 has 12 divisors (see below), whose sum is σ = 1344729906. Its totient is φ = 206881512.

The previous prime is 620644553. The next prime is 620644567. The reversal of 620644554 is 455446026.

620644554 is a `hidden beast` number, since 6 + 2 + 0 + 644 + 5 + 5 + 4 = 666.

620644554 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 335878929 + 284765625 = 18327^2 + 16875^2 .

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 5 ways as a sum of consecutive naturals, for example, 17240109 + ... + 17240144.

Almost surely, 2^620644554 is an apocalyptic number.

620644554 is an abundant number, since it is smaller than the sum of its proper divisors (724085352).

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

620644554 is a wasteful number, since it uses less digits than its factorization.

620644554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34480261 (or 34480258 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 36.

The square root of 620644554 is about 24912.7387896233. The cubic root of 620644554 is about 852.9972865377.

The spelling of 620644554 in words is "six hundred twenty million, six hundred forty-four thousand, five hundred fifty-four".