1028698025 has 6 divisors (see below), whose sum is σ = 1275585582. Its totient is φ = 822958400.

The previous prime is 1028698003. The next prime is 1028698037. The reversal of 1028698025 is 5208968201.

It can be written as a sum of positive squares in 3 ways, for example, as 36385024 + 992313001 = 6032^2 + 31501^2 .

It is not a de Polignac number, because 1028698025 - 2¹⁰ = 1028697001 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 20573936 + ... + 20573985.

It is an arithmetic number, because the mean of its divisors is an integer number (212597597).

Almost surely, 2^1028698025 is an apocalyptic number.

It is an amenable number.

1028698025 is a deficient number, since it is larger than the sum of its proper divisors (246887557).

1028698025 is an equidigital number, since it uses as much as digits as its factorization.

1028698025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41147931 (or 41147926 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 41.

The square root of 1028698025 is about 32073.3226373570. The cubic root of 1028698025 is about 1009.4759314319.

The spelling of 1028698025 in words is "one billion, twenty-eight million, six hundred ninety-eight thousand, twenty-five".