1628780725 has 24 divisors (see below), whose sum is σ = 2372785632. Its totient is φ = 1093444800.

The previous prime is 1628780717. The next prime is 1628780729. The reversal of 1628780725 is 5270878261.

It is not a de Polignac number, because 1628780725 - 2³ = 1628780717 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 (1628780729) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 224227 + ... + 231376.

It is an arithmetic number, because the mean of its divisors is an integer number (98866068).

Almost surely, 2^1628780725 is an apocalyptic number.

It is an amenable number.

1628780725 is a deficient number, since it is larger than the sum of its proper divisors (744004907).

1628780725 is a wasteful number, since it uses less digits than its factorization.

1628780725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 455637 (or 455632 counting only the distinct ones).

The product of its (nonzero) digits is 376320, while the sum is 46.

The square root of 1628780725 is about 40358.1556194036. The cubic root of 1628780725 is about 1176.5784068796.

The spelling of 1628780725 in words is "one billion, six hundred twenty-eight million, seven hundred eighty thousand, seven hundred twenty-five".