28478925049 has 9 divisors (see below), whose sum is σ = 29275847181. Its totient is φ = 27703149120.

The previous prime is 28478925047. The next prime is 28478925107. The reversal of 28478925049 is 94052987482.

It is a happy number.

The square root of 28478925049 is 168757.

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

It can be written as a sum of positive squares in 4 ways, for example, as 2277675625 + 26201249424 = 47725^2 + 161868^2 .

It is not a de Polignac number, because 28478925049 - 2¹ = 28478925047 is a prime.

It is a super-2 number, since 2×28478925049² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28478924984 and 28478925002.

It is not an unprimeable number, because it can be changed into a prime (28478925047) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 6241729 + ... + 6246289.

It is an arithmetic number, because the mean of its divisors is an integer number (3252871909).

Almost surely, 2^28478925049 is an apocalyptic number.

28478925049 is the 168757-th square number.

28478925049 is the 84379-th centered octagonal number.

It is an amenable number.

28478925049 is a deficient number, since it is larger than the sum of its proper divisors (796922132).

28478925049 is an frugal number, since it uses more digits than its factorization.

28478925049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9196 (or 4598 counting only the distinct ones).

The product of its (nonzero) digits is 11612160, while the sum is 58.

The spelling of 28478925049 in words is "twenty-eight billion, four hundred seventy-eight million, nine hundred twenty-five thousand, forty-nine".