628215757 has 12 divisors (see below), whose sum is σ = 684361440. Its totient is φ = 576393168.

The previous prime is 628215751. The next prime is 628215769. The reversal of 628215757 is 757512826.

It is not a de Polignac number, because 628215757 - 2¹⁹ = 627691469 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (628215751) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17094 + ... + 39352.

It is an arithmetic number, because the mean of its divisors is an integer number (57030120).

Almost surely, 2^628215757 is an apocalyptic number.

It is an amenable number.

628215757 is a deficient number, since it is larger than the sum of its proper divisors (56145683).

628215757 is a wasteful number, since it uses less digits than its factorization.

628215757 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22452 (or 22439 counting only the distinct ones).

The product of its digits is 235200, while the sum is 43.

The square root of 628215757 is about 25064.2326234018. The cubic root of 628215757 is about 856.4518301495.

The spelling of 628215757 in words is "six hundred twenty-eight million, two hundred fifteen thousand, seven hundred fifty-seven".