28780347 has 8 divisors (see below), whose sum is σ = 38914560. Its totient is φ = 18916520.

The previous prime is 28780331. The next prime is 28780351. The reversal of 28780347 is 74308782.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28780347 - 2⁴ = 28780331 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28780327) 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, 67347 + ... + 67772.

It is an arithmetic number, because the mean of its divisors is an integer number (4864320).

Almost surely, 2^28780347 is an apocalyptic number.

28780347 is a deficient number, since it is larger than the sum of its proper divisors (10134213).

28780347 is a wasteful number, since it uses less digits than its factorization.

28780347 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135193.

The product of its (nonzero) digits is 75264, while the sum is 39.

The square root of 28780347 is about 5364.7317733508. The cubic root of 28780347 is about 306.4540335766.

The spelling of 28780347 in words is "twenty-eight million, seven hundred eighty thousand, three hundred forty-seven".