628545947 has 4 divisors (see below), whose sum is σ = 665519256. Its totient is φ = 591572640.

The previous prime is 628545943. The next prime is 628545959. The reversal of 628545947 is 749545826.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 749545826 = 2 ⋅374772913.

It is a cyclic number.

It is not a de Polignac number, because 628545947 - 2² = 628545943 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 628545895 and 628545904.

It is not an unprimeable number, because it can be changed into a prime (628545941) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18486629 + ... + 18486662.

It is an arithmetic number, because the mean of its divisors is an integer number (166379814).

Almost surely, 2^628545947 is an apocalyptic number.

628545947 is a deficient number, since it is larger than the sum of its proper divisors (36973309).

628545947 is a wasteful number, since it uses less digits than its factorization.

628545947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36973308.

The product of its digits is 2419200, while the sum is 50.

The square root of 628545947 is about 25070.8186344204. The cubic root of 628545947 is about 856.6018541373.

The spelling of 628545947 in words is "six hundred twenty-eight million, five hundred forty-five thousand, nine hundred forty-seven".