28780102 has 8 divisors (see below), whose sum is σ = 46490976. Its totient is φ = 13283112.

The previous prime is 28780067. The next prime is 28780109. The reversal of 28780102 is 20108782.

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

It is a super-2 number, since 2×28780102² = 1656588542260808, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28780109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 553438 + ... + 553489.

It is an arithmetic number, because the mean of its divisors is an integer number (5811372).

Almost surely, 2^28780102 is an apocalyptic number.

28780102 is a deficient number, since it is larger than the sum of its proper divisors (17710874).

28780102 is a wasteful number, since it uses less digits than its factorization.

28780102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1106942.

The product of its (nonzero) digits is 1792, while the sum is 28.

The square root of 28780102 is about 5364.7089389826. The cubic root of 28780102 is about 306.4531639849.

Adding to 28780102 its reverse (20108782), we get a palindrome (48888884).

It can be divided in two parts, 28780 and 102, that added together give a palindrome (28882).

The spelling of 28780102 in words is "twenty-eight million, seven hundred eighty thousand, one hundred two".