28704401 has 4 divisors (see below), whose sum is σ = 31313904. Its totient is φ = 26094900.

The previous prime is 28704397. The next prime is 28704427. The reversal of 28704401 is 10440782.

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 28704401 - 2² = 28704397 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28704491) 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, 1304735 + ... + 1304756.

It is an arithmetic number, because the mean of its divisors is an integer number (7828476).

Almost surely, 2^28704401 is an apocalyptic number.

It is an amenable number.

28704401 is a deficient number, since it is larger than the sum of its proper divisors (2609503).

28704401 is a wasteful number, since it uses less digits than its factorization.

28704401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2609502.

The product of its (nonzero) digits is 1792, while the sum is 26.

The square root of 28704401 is about 5357.6488313438. The cubic root of 28704401 is about 306.1842376636.

The spelling of 28704401 in words is "twenty-eight million, seven hundred four thousand, four hundred one".