620655407 has 2 divisors, whose sum is σ = 620655408. Its totient is φ = 620655406.

The previous prime is 620655401. The next prime is 620655439. The reversal of 620655407 is 704556026.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 620655407 - 2²⁰ = 619606831 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (620655401) 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 as a sum of consecutive naturals, namely, 310327703 + 310327704.

It is an arithmetic number, because the mean of its divisors is an integer number (310327704).

Almost surely, 2^620655407 is an apocalyptic number.

620655407 is a deficient number, since it is larger than the sum of its proper divisors (1).

620655407 is an equidigital number, since it uses as much as digits as its factorization.

620655407 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 50400, while the sum is 35.

The square root of 620655407 is about 24912.9566089615. The cubic root of 620655407 is about 853.0022585331.

The spelling of 620655407 in words is "six hundred twenty million, six hundred fifty-five thousand, four hundred seven".