628881555 has 32 divisors (see below), whose sum is σ = 1023430464. Its totient is φ = 329711616.

The previous prime is 628881553. The next prime is 628881557. The reversal of 628881555 is 555188826.

It is an interprime number because it is at equal distance from previous prime (628881553) and next prime (628881557).

It is not a de Polignac number, because 628881555 - 2¹ = 628881553 is a prime.

It is not an unprimeable number, because it can be changed into a prime (628881553) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 227059 + ... + 229811.

It is an arithmetic number, because the mean of its divisors is an integer number (31982202).

Almost surely, 2^628881555 is an apocalyptic number.

628881555 is a deficient number, since it is larger than the sum of its proper divisors (394548909).

628881555 is a wasteful number, since it uses less digits than its factorization.

628881555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3015.

The product of its digits is 768000, while the sum is 48.

The square root of 628881555 is about 25077.5109410803. The cubic root of 628881555 is about 856.7542859975.

The spelling of 628881555 in words is "six hundred twenty-eight million, eight hundred eighty-one thousand, five hundred fifty-five".