628780415 has 4 divisors (see below), whose sum is σ = 754536504. Its totient is φ = 503024328.

The previous prime is 628780363. The next prime is 628780441. The reversal of 628780415 is 514087826.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 628780415 - 2¹² = 628776319 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 62878037 + ... + 62878046.

It is an arithmetic number, because the mean of its divisors is an integer number (188634126).

Almost surely, 2^628780415 is an apocalyptic number.

628780415 is a deficient number, since it is larger than the sum of its proper divisors (125756089).

628780415 is a wasteful number, since it uses less digits than its factorization.

628780415 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125756088.

The product of its (nonzero) digits is 107520, while the sum is 41.

The square root of 628780415 is about 25075.4943121766. The cubic root of 628780415 is about 856.7083543095.

The spelling of 628780415 in words is "six hundred twenty-eight million, seven hundred eighty thousand, four hundred fifteen".