28293961 has 4 divisors (see below), whose sum is σ = 28418832. Its totient is φ = 28169092.

The previous prime is 28293959. The next prime is 28294031. The reversal of 28293961 is 16939282.

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, and also an emirpimes, since its reverse is a distinct semiprime: 16939282 = 2 ⋅8469641.

It is a cyclic number.

It is not a de Polignac number, because 28293961 - 2¹ = 28293959 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28293911) 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, 62095 + ... + 62548.

It is an arithmetic number, because the mean of its divisors is an integer number (7104708).

Almost surely, 2^28293961 is an apocalyptic number.

It is an amenable number.

28293961 is a deficient number, since it is larger than the sum of its proper divisors (124871).

28293961 is a wasteful number, since it uses less digits than its factorization.

28293961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124870.

The product of its digits is 46656, while the sum is 40.

The square root of 28293961 is about 5319.2068017704. The cubic root of 28293961 is about 304.7178650482.

The spelling of 28293961 in words is "twenty-eight million, two hundred ninety-three thousand, nine hundred sixty-one".