28780955 has 8 divisors (see below), whose sum is σ = 39471072. Its totient is φ = 19735488.

The previous prime is 28780951. The next prime is 28781003. The reversal of 28780955 is 55908782.

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 28780955 - 2² = 28780951 is a prime.

It is a super-3 number, since 3×28780955³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28780951) 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, 411122 + ... + 411191.

It is an arithmetic number, because the mean of its divisors is an integer number (4933884).

Almost surely, 2^28780955 is an apocalyptic number.

28780955 is a deficient number, since it is larger than the sum of its proper divisors (10690117).

28780955 is an equidigital number, since it uses as much as digits as its factorization.

28780955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 822325.

The product of its (nonzero) digits is 201600, while the sum is 44.

The square root of 28780955 is about 5364.7884394447. The cubic root of 28780955 is about 306.4561915624.

The spelling of 28780955 in words is "twenty-eight million, seven hundred eighty thousand, nine hundred fifty-five".