28696261 has 4 divisors (see below), whose sum is σ = 31305024. Its totient is φ = 26087500.

The previous prime is 28696259. The next prime is 28696271. The reversal of 28696261 is 16269682.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28696261 - 2¹ = 28696259 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28696231) 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, 1304365 + ... + 1304386.

It is an arithmetic number, because the mean of its divisors is an integer number (7826256).

Almost surely, 2^28696261 is an apocalyptic number.

It is an amenable number.

28696261 is a deficient number, since it is larger than the sum of its proper divisors (2608763).

28696261 is a wasteful number, since it uses less digits than its factorization.

28696261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2608762.

The product of its digits is 62208, while the sum is 40.

The square root of 28696261 is about 5356.8891158955. The cubic root of 28696261 is about 306.1552923307.

The spelling of 28696261 in words is "twenty-eight million, six hundred ninety-six thousand, two hundred sixty-one".