28918703025 has 45 divisors (see below), whose sum is σ = 53581613371. Its totient is φ = 15419226960.

The previous prime is 28918703017. The next prime is 28918703063. The reversal of 28918703025 is 52030781982.

It is a happy number.

The square root of 28918703025 is 170055.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 10410733089 + 18507969936 = 102033^2 + 136044^2 .

It is a tau number, because it is divible by the number of its divisors (45).

It is not a de Polignac number, because 28918703025 - 2³ = 28918703017 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

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 (19) of ones.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 7650586 + ... + 7654364.

Almost surely, 2^28918703025 is an apocalyptic number.

28918703025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28918703025 is the 170055-th square number.

28918703025 is the 85028-th centered octagonal number.

It is an amenable number.

28918703025 is a deficient number, since it is larger than the sum of its proper divisors (24662910346).

28918703025 is an frugal number, since it uses more digits than its factorization.

28918703025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7580 (or 3787 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 45.

The spelling of 28918703025 in words is "twenty-eight billion, nine hundred eighteen million, seven hundred three thousand, twenty-five".