628557540 has 48 divisors (see below), whose sum is σ = 1895345088. Its totient is φ = 154721664.

The previous prime is 628557529. The next prime is 628557551. The reversal of 628557540 is 45755826.

628557540 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (628557529) and next prime (628557551).

It is a hoax number, since the sum of its digits (42) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 628557492 and 628557501.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 402142 + ... + 403701.

It is an arithmetic number, because the mean of its divisors is an integer number (39486356).

Almost surely, 2^628557540 is an apocalyptic number.

628557540 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

628557540 is an abundant number, since it is smaller than the sum of its proper divisors (1266787548).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

628557540 is a wasteful number, since it uses less digits than its factorization.

628557540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 805868 (or 805866 counting only the distinct ones).

The product of its (nonzero) digits is 336000, while the sum is 42.

The square root of 628557540 is about 25071.0498384092. The cubic root of 628557540 is about 856.6071205379.

The spelling of 628557540 in words is "six hundred twenty-eight million, five hundred fifty-seven thousand, five hundred forty".