28780299 has 8 divisors (see below), whose sum is σ = 42637520. Its totient is φ = 19186848.

The previous prime is 28780289. The next prime is 28780313. The reversal of 28780299 is 99208782.

28780299 is a `hidden beast` number, since 287 + 80 + 299 = 666.

It is not a de Polignac number, because 28780299 - 2¹⁷ = 28649227 is a prime.

It is a super-2 number, since 2×28780299² = 1656611221058802, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28780249) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 532942 + ... + 532995.

It is an arithmetic number, because the mean of its divisors is an integer number (5329690).

Almost surely, 2^28780299 is an apocalyptic number.

28780299 is a deficient number, since it is larger than the sum of its proper divisors (13857221).

28780299 is a wasteful number, since it uses less digits than its factorization.

28780299 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1065946 (or 1065940 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 45.

The square root of 28780299 is about 5364.7272996864. The cubic root of 28780299 is about 306.4538632080.

The spelling of 28780299 in words is "twenty-eight million, seven hundred eighty thousand, two hundred ninety-nine".