620564655 has 32 divisors (see below), whose sum is σ = 1014508800. Its totient is φ = 323820032.

The previous prime is 620564621. The next prime is 620564677. The reversal of 620564655 is 556465026.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 620564655 - 2⁹ = 620564143 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 199351 + ... + 202439.

It is an arithmetic number, because the mean of its divisors is an integer number (31703400).

Almost surely, 2^620564655 is an apocalyptic number.

620564655 is a deficient number, since it is larger than the sum of its proper divisors (393944145).

620564655 is a wasteful number, since it uses less digits than its factorization.

620564655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3383.

The product of its (nonzero) digits is 216000, while the sum is 39.

The square root of 620564655 is about 24911.1351608071. The cubic root of 620564655 is about 852.9606812835.

The spelling of 620564655 in words is "six hundred twenty million, five hundred sixty-four thousand, six hundred fifty-five".