28507707 has 20 divisors (see below), whose sum is σ = 43194096. Its totient is φ = 18733680.

The previous prime is 28507697. The next prime is 28507729. The reversal of 28507707 is 70770582.

It is not a de Polignac number, because 28507707 - 2⁶ = 28507643 is a prime.

It is a super-3 number, since 3×28507707³ (a number of 23 digits) contains 333 as substring.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (28507747) by changing a digit.

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 19 ways as a sum of consecutive naturals, for example, 3273 + ... + 8229.

Almost surely, 2^28507707 is an apocalyptic number.

28507707 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

28507707 is a deficient number, since it is larger than the sum of its proper divisors (14686389).

28507707 is an equidigital number, since it uses as much as digits as its factorization.

28507707 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5040 (or 5031 counting only the distinct ones).

The product of its (nonzero) digits is 27440, while the sum is 36.

The square root of 28507707 is about 5339.2609039080. The cubic root of 28507707 is about 305.4832686203.

The spelling of 28507707 in words is "twenty-eight million, five hundred seven thousand, seven hundred seven".