28107961 has 8 divisors (see below), whose sum is σ = 32155520. Its totient is φ = 24068448.

The previous prime is 28107929. The next prime is 28107971. The reversal of 28107961 is 16970182.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28107961 - 2⁵ = 28107929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28107971) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12085 + ... + 14221.

It is an arithmetic number, because the mean of its divisors is an integer number (4019440).

Almost surely, 2^28107961 is an apocalyptic number.

It is an amenable number.

28107961 is a deficient number, since it is larger than the sum of its proper divisors (4047559).

28107961 is a wasteful number, since it uses less digits than its factorization.

28107961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4023.

The product of its (nonzero) digits is 6048, while the sum is 34.

The square root of 28107961 is about 5301.6941631897. The cubic root of 28107961 is about 304.0486742526.

The spelling of 28107961 in words is "twenty-eight million, one hundred seven thousand, nine hundred sixty-one".