28390007 has 8 divisors (see below), whose sum is σ = 28776336. Its totient is φ = 28006272.

The previous prime is 28390003. The next prime is 28390091. The reversal of 28390007 is 70009382.

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 28390007 - 2² = 28390003 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 (28390001) 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, 30848 + ... + 31754.

It is an arithmetic number, because the mean of its divisors is an integer number (3597042).

Almost surely, 2^28390007 is an apocalyptic number.

28390007 is a deficient number, since it is larger than the sum of its proper divisors (386329).

28390007 is a wasteful number, since it uses less digits than its factorization.

28390007 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1297.

The product of its (nonzero) digits is 3024, while the sum is 29.

The square root of 28390007 is about 5328.2273787818. The cubic root of 28390007 is about 305.0622716174.

Adding to 28390007 its reverse (70009382), we get a palindrome (98399389).

The spelling of 28390007 in words is "twenty-eight million, three hundred ninety thousand, seven".