28782207 has 24 divisors (see below), whose sum is σ = 46341360. Its totient is φ = 17107200.

The previous prime is 28782203. The next prime is 28782209. The reversal of 28782207 is 70228782.

It is not a de Polignac number, because 28782207 - 2² = 28782203 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28782203) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2044 + ... + 7857.

It is an arithmetic number, because the mean of its divisors is an integer number (1930890).

Almost surely, 2^28782207 is an apocalyptic number.

28782207 is a deficient number, since it is larger than the sum of its proper divisors (17559153).

28782207 is a wasteful number, since it uses less digits than its factorization.

28782207 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9943 (or 9940 counting only the distinct ones).

The product of its (nonzero) digits is 25088, while the sum is 36.

The square root of 28782207 is about 5364.9051249766. The cubic root of 28782207 is about 306.4606352137.

The spelling of 28782207 in words is "twenty-eight million, seven hundred eighty-two thousand, two hundred seven".