620728145 has 16 divisors (see below), whose sum is σ = 753701760. Its totient is φ = 490733184.

The previous prime is 620728139. The next prime is 620728193. The reversal of 620728145 is 541827026.

It is a cyclic number.

It is not a de Polignac number, because 620728145 - 2⁸ = 620727889 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 147389 + ... + 151541.

It is an arithmetic number, because the mean of its divisors is an integer number (47106360).

Almost surely, 2^620728145 is an apocalyptic number.

It is an amenable number.

620728145 is a deficient number, since it is larger than the sum of its proper divisors (132973615).

620728145 is a wasteful number, since it uses less digits than its factorization.

620728145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4504.

The product of its (nonzero) digits is 26880, while the sum is 35.

The square root of 620728145 is about 24914.4164089790. The cubic root of 620728145 is about 853.0355798973.

The spelling of 620728145 in words is "six hundred twenty million, seven hundred twenty-eight thousand, one hundred forty-five".