620780155 has 8 divisors (see below), whose sum is σ = 745712352. Its totient is φ = 496106688.

The previous prime is 620780131. The next prime is 620780201. The reversal of 620780155 is 551087026.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 620780155 - 2¹¹ = 620778107 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 620780155.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59362 + ... + 69031.

It is an arithmetic number, because the mean of its divisors is an integer number (93214044).

Almost surely, 2^620780155 is an apocalyptic number.

620780155 is a deficient number, since it is larger than the sum of its proper divisors (124932197).

620780155 is a wasteful number, since it uses less digits than its factorization.

620780155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129365.

The product of its (nonzero) digits is 16800, while the sum is 34.

The square root of 620780155 is about 24915.4601603101. The cubic root of 620780155 is about 853.0594041440.

The spelling of 620780155 in words is "six hundred twenty million, seven hundred eighty thousand, one hundred fifty-five".