1628813725 has 24 divisors (see below), whose sum is σ = 2518106688. Its totient is φ = 1015363200.

The previous prime is 1628813723. The next prime is 1628813777. The reversal of 1628813725 is 5273188261.

It is not a de Polignac number, because 1628813725 - 2¹ = 1628813723 is a prime.

It is a hoax number, since the sum of its digits (43) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1628813723) 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, 421144 + ... + 424993.

It is an arithmetic number, because the mean of its divisors is an integer number (104921112).

Almost surely, 2^1628813725 is an apocalyptic number.

It is an amenable number.

1628813725 is a deficient number, since it is larger than the sum of its proper divisors (889292963).

1628813725 is a wasteful number, since it uses less digits than its factorization.

1628813725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 846165 (or 846160 counting only the distinct ones).

The product of its digits is 161280, while the sum is 43.

The square root of 1628813725 is about 40358.5644566305. The cubic root of 1628813725 is about 1176.5863528694.

The spelling of 1628813725 in words is "one billion, six hundred twenty-eight million, eight hundred thirteen thousand, seven hundred twenty-five".