28400319348025 has 9 divisors (see below), whose sum is σ = 35216429032591. Its totient is φ = 22720234161640.

The previous prime is 28400319347999. The next prime is 28400319348077. The reversal of 28400319348025 is 52084391300482.

It is a happy number.

The square root of 28400319348025 is 5329195.

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., 10224114965289 + 18176204382736 = 3197517^2 + 4263356^2 .

It is not a de Polignac number, because 28400319348025 - 2¹⁵ = 28400319315257 is a prime.

It is a super-2 number, since 2×28400319348025² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28400319348025.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 26113056 + ... + 27178894.

Almost surely, 2^{28400319348025} is an apocalyptic number.

28400319348025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28400319348025 is the 5329195-th square number.

28400319348025 is the 2664598-th centered octagonal number.

It is an amenable number.

28400319348025 is a deficient number, since it is larger than the sum of its proper divisors (6816109684566).

28400319348025 is an frugal number, since it uses more digits than its factorization.

28400319348025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2131688 (or 1065844 counting only the distinct ones).

The product of its (nonzero) digits is 1658880, while the sum is 49.

The spelling of 28400319348025 in words is "twenty-eight trillion, four hundred billion, three hundred nineteen million, three hundred forty-eight thousand, twenty-five".