28351607 has 4 divisors (see below), whose sum is σ = 28574976. Its totient is φ = 28128240.

The previous prime is 28351567. The next prime is 28351613. The reversal of 28351607 is 70615382.

It is a happy number.

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 28351607 - 2¹² = 28347511 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28351627) 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, 111494 + ... + 111747.

It is an arithmetic number, because the mean of its divisors is an integer number (7143744).

Almost surely, 2^28351607 is an apocalyptic number.

28351607 is a deficient number, since it is larger than the sum of its proper divisors (223369).

28351607 is a wasteful number, since it uses less digits than its factorization.

28351607 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 223368.

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 28351607 is about 5324.6227096387. The cubic root of 28351607 is about 304.9246683075.

Adding to 28351607 its reverse (70615382), we get a palindrome (98966989).

The spelling of 28351607 in words is "twenty-eight million, three hundred fifty-one thousand, six hundred seven".