28356904438 has 8 divisors (see below), whose sum is σ = 42755747688. Its totient is φ = 14104988544.

The previous prime is 28356904421. The next prime is 28356904489. The reversal of 28356904438 is 83440965382.

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

It is a super-2 number, since 2×28356904438² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36731356 + ... + 36732127.

It is an arithmetic number, because the mean of its divisors is an integer number (5344468461).

Almost surely, 2^28356904438 is an apocalyptic number.

28356904438 is a deficient number, since it is larger than the sum of its proper divisors (14398843250).

28356904438 is a wasteful number, since it uses less digits than its factorization.

28356904438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73463678.

The product of its (nonzero) digits is 4976640, while the sum is 52.

The spelling of 28356904438 in words is "twenty-eight billion, three hundred fifty-six million, nine hundred four thousand, four hundred thirty-eight".