28402003 has 8 divisors (see below), whose sum is σ = 32497920. Its totient is φ = 24315720.

The previous prime is 28401937. The next prime is 28402007. The reversal of 28402003 is 30020482.

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 28402003 - 2²¹ = 26304851 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28402007) 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, 5778 + ... + 9496.

It is an arithmetic number, because the mean of its divisors is an integer number (4062240).

Almost surely, 2^28402003 is an apocalyptic number.

28402003 is a deficient number, since it is larger than the sum of its proper divisors (4095917).

28402003 is a wasteful number, since it uses less digits than its factorization.

28402003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4817.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 28402003 is about 5329.3529626025. The cubic root of 28402003 is about 305.1052328806.

Adding to 28402003 its reverse (30020482), we get a palindrome (58422485).

The spelling of 28402003 in words is "twenty-eight million, four hundred two thousand, three".