28401043 has 4 divisors (see below), whose sum is σ = 30982968. Its totient is φ = 25819120.

The previous prime is 28401041. The next prime is 28401049. The reversal of 28401043 is 34010482.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28401043 - 2¹ = 28401041 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28401041) 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, 1290946 + ... + 1290967.

It is an arithmetic number, because the mean of its divisors is an integer number (7745742).

Almost surely, 2^28401043 is an apocalyptic number.

28401043 is a deficient number, since it is larger than the sum of its proper divisors (2581925).

28401043 is a wasteful number, since it uses less digits than its factorization.

28401043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2581924.

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 28401043 is about 5329.2628946225. The cubic root of 28401043 is about 305.1017952789.

It can be divided in two parts, 2840 and 1043, that added together give a palindrome (3883).

The spelling of 28401043 in words is "twenty-eight million, four hundred one thousand, forty-three".