28722900390625 has 91 divisors (see below), whose sum is σ = 41887512172717. Its totient is φ = 19695703125000.

The previous prime is 28722900390619. The next prime is 28722900390631. The reversal of 28722900390625 is 52609300922782.

The square root of 28722900390625 is 5359375.

The cubic root of 28722900390625 is 30625.

It is a perfect power (a square, a cube, a 6-th power), and thus also a powerful number.

It is an interprime number because it is at equal distance from previous prime (28722900390619) and next prime (28722900390631).

It can be written as a sum of positive squares in 6 ways, for example, as 16251210375841 + 12471690014784 = 4031279^2 + 3531528^2 .

It is not a de Polignac number, because 28722900390625 - 2³⁵ = 28688540652257 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 90 ways as a sum of consecutive naturals, for example, 4103271484372 + ... + 4103271484378.

Almost surely, 2^{28722900390625} is an apocalyptic number.

28722900390625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28722900390625 is the 5359375-th square number.

28722900390625 is the 2679688-th centered octagonal number.

It is an amenable number.

28722900390625 is a deficient number, since it is larger than the sum of its proper divisors (13164611782092).

28722900390625 is an frugal number, since it uses more digits than its factorization.

28722900390625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102 (or 12 counting only the distinct ones).

The product of its (nonzero) digits is 6531840, while the sum is 55.

The spelling of 28722900390625 in words is "twenty-eight trillion, seven hundred twenty-two billion, nine hundred million, three hundred ninety thousand, six hundred twenty-five".