628405678 has 16 divisors (see below), whose sum is σ = 993148416. Its totient is φ = 297621720.

The previous prime is 628405633. The next prime is 628405691. The reversal of 628405678 is 876504826.

It is a super-2 number, since 2×628405678² = 789787392285279368, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (46).

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 61578 + ... + 71053.

It is an arithmetic number, because the mean of its divisors is an integer number (62071776).

Almost surely, 2^628405678 is an apocalyptic number.

628405678 is a deficient number, since it is larger than the sum of its proper divisors (364742738).

628405678 is a wasteful number, since it uses less digits than its factorization.

628405678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132759.

The product of its (nonzero) digits is 645120, while the sum is 46.

The square root of 628405678 is about 25068.0210228091. The cubic root of 628405678 is about 856.5381284196.

The spelling of 628405678 in words is "six hundred twenty-eight million, four hundred five thousand, six hundred seventy-eight".