28975691 has 8 divisors (see below), whose sum is σ = 29542464. Its totient is φ = 28413000.

The previous prime is 28975673. The next prime is 28975693. The reversal of 28975691 is 19657982.

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 28975691 - 2¹⁸ = 28713547 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28975693) 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, 15956 + ... + 17678.

It is an arithmetic number, because the mean of its divisors is an integer number (3692808).

Almost surely, 2^28975691 is an apocalyptic number.

28975691 is a deficient number, since it is larger than the sum of its proper divisors (566773).

28975691 is a wasteful number, since it uses less digits than its factorization.

28975691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2041.

The product of its digits is 272160, while the sum is 47.

The square root of 28975691 is about 5382.9072999635. The cubic root of 28975691 is about 307.1458138014.

The spelling of 28975691 in words is "twenty-eight million, nine hundred seventy-five thousand, six hundred ninety-one".