28669262401 has 4 divisors (see below), whose sum is σ = 30874590292. Its totient is φ = 26463934512.

The previous prime is 28669262353. The next prime is 28669262407. The reversal of 28669262401 is 10426296682.

It is a Cunningham number, because it is equal to 169320²+1.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4241135376 + 24428127025 = 65124^2 + 156295^2 .

It is a cyclic number.

It is not a de Polignac number, because 28669262401 - 2¹³ = 28669254209 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28669262407) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1102663926 + ... + 1102663951.

It is an arithmetic number, because the mean of its divisors is an integer number (7718647573).

Almost surely, 2^28669262401 is an apocalyptic number.

It is an amenable number.

28669262401 is a deficient number, since it is larger than the sum of its proper divisors (2205327891).

28669262401 is a wasteful number, since it uses less digits than its factorization.

28669262401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2205327890.

The product of its (nonzero) digits is 497664, while the sum is 46.

The spelling of 28669262401 in words is "twenty-eight billion, six hundred sixty-nine million, two hundred sixty-two thousand, four hundred one".