1628780948 has 24 divisors (see below), whose sum is σ = 3074986152. Its totient is φ = 752021504.

The previous prime is 1628780941. The next prime is 1628780977. The reversal of 1628780948 is 8490878261.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 469242244 + 1159538704 = 21662^2 + 34052^2 .

It is a Harshad number since it is a multiple of its sum of digits (53).

It is a self number, because there is not a number n which added to its sum of digits gives 1628780948.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1628780941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 222365 + ... + 229572.

It is an arithmetic number, because the mean of its divisors is an integer number (128124423).

Almost surely, 2^1628780948 is an apocalyptic number.

It is an amenable number.

1628780948 is a deficient number, since it is larger than the sum of its proper divisors (1446205204).

1628780948 is a wasteful number, since it uses less digits than its factorization.

1628780948 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 452011 (or 452009 counting only the distinct ones).

The product of its (nonzero) digits is 1548288, while the sum is 53.

The square root of 1628780948 is about 40358.1583821661. The cubic root of 1628780948 is about 1176.5784605756.

The spelling of 1628780948 in words is "one billion, six hundred twenty-eight million, seven hundred eighty thousand, nine hundred forty-eight".