628440625 has 12 divisors (see below), whose sum is σ = 785504412. Its totient is φ = 502750000.

The previous prime is 628440623. The next prime is 628440641. The reversal of 628440625 is 526044826.

It can be written as a sum of positive squares in 6 ways, for example, as 611276176 + 17164449 = 24724^2 + 4143^2 .

It is not a de Polignac number, because 628440625 - 2¹ = 628440623 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (628440623) 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, 97426 + ... + 103675.

It is an arithmetic number, because the mean of its divisors is an integer number (65458701).

Almost surely, 2^628440625 is an apocalyptic number.

It is an amenable number.

628440625 is a deficient number, since it is larger than the sum of its proper divisors (157063787).

628440625 is an frugal number, since it uses more digits than its factorization.

628440625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201126 (or 201106 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 37.

The square root of 628440625 is about 25068.7180565740. The cubic root of 628440625 is about 856.5540061051.

The spelling of 628440625 in words is "six hundred twenty-eight million, four hundred forty thousand, six hundred twenty-five".