628887779 has 16 divisors (see below), whose sum is σ = 698473440. Its totient is φ = 562464000.

The previous prime is 628887761. The next prime is 628887797. The reversal of 628887779 is 977788826.

It is an interprime number because it is at equal distance from previous prime (628887761) and next prime (628887797).

It is a cyclic number.

It is not a de Polignac number, because 628887779 - 2¹² = 628883683 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (628887079) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 118127 + ... + 123335.

It is an arithmetic number, because the mean of its divisors is an integer number (43654590).

Almost surely, 2^628887779 is an apocalyptic number.

628887779 is a deficient number, since it is larger than the sum of its proper divisors (69585661).

628887779 is a wasteful number, since it uses less digits than its factorization.

628887779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5510.

The product of its digits is 18966528, while the sum is 62.

The square root of 628887779 is about 25077.6350360236. The cubic root of 628887779 is about 856.7571124021.

The spelling of 628887779 in words is "six hundred twenty-eight million, eight hundred eighty-seven thousand, seven hundred seventy-nine".