28456401 has 8 divisors (see below), whose sum is σ = 38057824. Its totient is φ = 18912960.

The previous prime is 28456399. The next prime is 28456423. The reversal of 28456401 is 10465482.

28456401 = T₂₃₈ + T₂₃₉ + ... + T₅₆₈.

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

It is not a de Polignac number, because 28456401 - 2¹ = 28456399 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28458401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13336 + ... + 15321.

It is an arithmetic number, because the mean of its divisors is an integer number (4757228).

Almost surely, 2^28456401 is an apocalyptic number.

It is an amenable number.

28456401 is a deficient number, since it is larger than the sum of its proper divisors (9601423).

28456401 is a wasteful number, since it uses less digits than its factorization.

28456401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28991.

The product of its (nonzero) digits is 7680, while the sum is 30.

The square root of 28456401 is about 5334.4541426466. The cubic root of 28456401 is about 305.2998967292.

The spelling of 28456401 in words is "twenty-eight million, four hundred fifty-six thousand, four hundred one".