28591407 has 16 divisors (see below), whose sum is σ = 45616480. Its totient is φ = 17594496.

The previous prime is 28591403. The next prime is 28591439. The reversal of 28591407 is 70419582.

28591407 is a `hidden beast` number, since 28 + 591 + 40 + 7 = 666.

It is not a de Polignac number, because 28591407 - 2² = 28591403 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28591403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40378 + ... + 41079.

It is an arithmetic number, because the mean of its divisors is an integer number (2851030).

Almost surely, 2^28591407 is an apocalyptic number.

28591407 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

28591407 is a deficient number, since it is larger than the sum of its proper divisors (17025073).

28591407 is a wasteful number, since it uses less digits than its factorization.

28591407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81479 (or 81473 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The square root of 28591407 is about 5347.0933225445. The cubic root of 28591407 is about 305.7819476925.

The spelling of 28591407 in words is "twenty-eight million, five hundred ninety-one thousand, four hundred seven".