628880091 has 8 divisors (see below), whose sum is σ = 958293504. Its totient is φ = 359360040.

The previous prime is 628880089. The next prime is 628880093. The reversal of 628880091 is 190088826.

It is an interprime number because it is at equal distance from previous prime (628880089) and next prime (628880093).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 628880091 - 2¹ = 628880089 is a prime.

It is not an unprimeable number, because it can be changed into a prime (628880093) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14973315 + ... + 14973356.

It is an arithmetic number, because the mean of its divisors is an integer number (119786688).

Almost surely, 2^628880091 is an apocalyptic number.

628880091 is a deficient number, since it is larger than the sum of its proper divisors (329413413).

628880091 is a wasteful number, since it uses less digits than its factorization.

628880091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29946681.

The product of its (nonzero) digits is 55296, while the sum is 42.

The square root of 628880091 is about 25077.4817515635. The cubic root of 628880091 is about 856.7536211721.

The spelling of 628880091 in words is "six hundred twenty-eight million, eight hundred eighty thousand, ninety-one".