28057007 has 16 divisors (see below), whose sum is σ = 31877280. Its totient is φ = 24460800.

The previous prime is 28056961. The next prime is 28057009. The reversal of 28057007 is 70075082.

It is a cyclic number.

It is not a de Polignac number, because 28057007 - 2⁶ = 28056943 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28057009) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 89483 + ... + 89795.

It is an arithmetic number, because the mean of its divisors is an integer number (1992330).

Almost surely, 2^28057007 is an apocalyptic number.

28057007 is a deficient number, since it is larger than the sum of its proper divisors (3820273).

28057007 is a wasteful number, since it uses less digits than its factorization.

28057007 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 634.

The product of its (nonzero) digits is 3920, while the sum is 29.

The square root of 28057007 is about 5296.8865383355. The cubic root of 28057007 is about 303.8648370452.

The spelling of 28057007 in words is "twenty-eight million, fifty-seven thousand, seven".