28621107 has 20 divisors (see below), whose sum is σ = 42969520. Its totient is φ = 18985104.

The previous prime is 28621097. The next prime is 28621121. The reversal of 28621107 is 70112682.

28621107 is a `hidden beast` number, since 28 + 621 + 10 + 7 = 666.

It is not a de Polignac number, because 28621107 - 2¹⁰ = 28620083 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28621507) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 17778 + ... + 19320.

It is an arithmetic number, because the mean of its divisors is an integer number (2148476).

Almost surely, 2^28621107 is an apocalyptic number.

28621107 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

28621107 is a deficient number, since it is larger than the sum of its proper divisors (14348413).

28621107 is a wasteful number, since it uses less digits than its factorization.

28621107 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1784 (or 1775 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 27.

The square root of 28621107 is about 5349.8698115001. The cubic root of 28621107 is about 305.8877904613.

Adding to 28621107 its reverse (70112682), we get a palindrome (98733789).

It can be divided in two parts, 2862 and 1107, that added together give a square (3969 = 63²).

The spelling of 28621107 in words is "twenty-eight million, six hundred twenty-one thousand, one hundred seven".