628145977 has 4 divisors (see below), whose sum is σ = 628420096. Its totient is φ = 627871860.

The previous prime is 628145941. The next prime is 628145981. The reversal of 628145977 is 779541826.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 628145977 - 2²⁷ = 493928249 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 628145977.

It is not an unprimeable number, because it can be changed into a prime (628145927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 133593 + ... + 138214.

It is an arithmetic number, because the mean of its divisors is an integer number (157105024).

Almost surely, 2^628145977 is an apocalyptic number.

It is an amenable number.

628145977 is a deficient number, since it is larger than the sum of its proper divisors (274119).

628145977 is a wasteful number, since it uses less digits than its factorization.

628145977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 274118.

The product of its digits is 846720, while the sum is 49.

The square root of 628145977 is about 25062.8405612772. The cubic root of 628145977 is about 856.4201184215.

The spelling of 628145977 in words is "six hundred twenty-eight million, one hundred forty-five thousand, nine hundred seventy-seven".