28662407 has 4 divisors (see below), whose sum is σ = 28881336. Its totient is φ = 28443480.

The previous prime is 28662401. The next prime is 28662419. The reversal of 28662407 is 70426682.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28662407 - 2⁶ = 28662343 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28662401) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 109268 + ... + 109529.

It is an arithmetic number, because the mean of its divisors is an integer number (7220334).

Almost surely, 2^28662407 is an apocalyptic number.

28662407 is a deficient number, since it is larger than the sum of its proper divisors (218929).

28662407 is a wasteful number, since it uses less digits than its factorization.

28662407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218928.

The product of its (nonzero) digits is 32256, while the sum is 35.

The square root of 28662407 is about 5353.7283270633. The cubic root of 28662407 is about 306.0348508585.

The spelling of 28662407 in words is "twenty-eight million, six hundred sixty-two thousand, four hundred seven".