28907137 has 16 divisors (see below), whose sum is σ = 34100352. Its totient is φ = 23990400.

The previous prime is 28907117. The next prime is 28907149. The reversal of 28907137 is 73170982.

It is not a de Polignac number, because 28907137 - 2²³ = 20518529 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28907096 and 28907105.

It is not an unprimeable number, because it can be changed into a prime (28907117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40887 + ... + 41587.

It is an arithmetic number, because the mean of its divisors is an integer number (2131272).

Almost surely, 2^28907137 is an apocalyptic number.

It is an amenable number.

28907137 is a deficient number, since it is larger than the sum of its proper divisors (5193215).

28907137 is a wasteful number, since it uses less digits than its factorization.

28907137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 888.

The product of its (nonzero) digits is 21168, while the sum is 37.

The square root of 28907137 is about 5376.5357805933. The cubic root of 28907137 is about 306.9033956355.

The spelling of 28907137 in words is "twenty-eight million, nine hundred seven thousand, one hundred thirty-seven".