28423402 has 8 divisors (see below), whose sum is σ = 48725856. Its totient is φ = 12181452.

The previous prime is 28423399. The next prime is 28423441. The reversal of 28423402 is 20432482.

28423402 = 994² + 995² + ... + 1021².

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1015108 + ... + 1015135.

It is an arithmetic number, because the mean of its divisors is an integer number (6090732).

Almost surely, 2^28423402 is an apocalyptic number.

28423402 is a deficient number, since it is larger than the sum of its proper divisors (20302454).

28423402 is a wasteful number, since it uses less digits than its factorization.

28423402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2030252.

The product of its (nonzero) digits is 3072, while the sum is 25.

The square root of 28423402 is about 5331.3602391885. The cubic root of 28423402 is about 305.1818390723.

Adding to 28423402 its reverse (20432482), we get a palindrome (48855884).

The spelling of 28423402 in words is "twenty-eight million, four hundred twenty-three thousand, four hundred two".