620728155 has 12 divisors (see below), whose sum is σ = 1075928880. Its totient is φ = 331054992.

The previous prime is 620728139. The next prime is 620728193. The reversal of 620728155 is 551827026.

It is a happy number.

620728155 is a `hidden beast` number, since 620 + 7 + 28 + 1 + 5 + 5 = 666.

It is not a de Polignac number, because 620728155 - 2⁴ = 620728139 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6896935 + ... + 6897024.

It is an arithmetic number, because the mean of its divisors is an integer number (89660740).

Almost surely, 2^620728155 is an apocalyptic number.

620728155 is a deficient number, since it is larger than the sum of its proper divisors (455200725).

620728155 is a wasteful number, since it uses less digits than its factorization.

620728155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13793970 (or 13793967 counting only the distinct ones).

The product of its (nonzero) digits is 33600, while the sum is 36.

The square root of 620728155 is about 24914.4166096660. The cubic root of 620728155 is about 853.0355844781.

The spelling of 620728155 in words is "six hundred twenty million, seven hundred twenty-eight thousand, one hundred fifty-five".