28401507 has 6 divisors (see below), whose sum is σ = 41024412. Its totient is φ = 18934332.

The previous prime is 28401497. The next prime is 28401511. The reversal of 28401507 is 70510482.

It is not a de Polignac number, because 28401507 - 2⁷ = 28401379 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28401517) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1577853 + ... + 1577870.

It is an arithmetic number, because the mean of its divisors is an integer number (6837402).

Almost surely, 2^28401507 is an apocalyptic number.

28401507 is a deficient number, since it is larger than the sum of its proper divisors (12622905).

28401507 is a wasteful number, since it uses less digits than its factorization.

28401507 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3155729 (or 3155726 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 27.

The square root of 28401507 is about 5329.3064276696. The cubic root of 28401507 is about 305.1034567961.

Adding to 28401507 its reverse (70510482), we get a palindrome (98911989).

The spelling of 28401507 in words is "twenty-eight million, four hundred one thousand, five hundred seven".