28621017 has 24 divisors (see below), whose sum is σ = 43185480. Its totient is φ = 18247680.

The previous prime is 28621009. The next prime is 28621027. The reversal of 28621017 is 71012682.

28621017 is a `hidden beast` number, since 28 + 621 + 0 + 17 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 9216 + 28611801 = 96^2 + 5349^2 .

It is not a de Polignac number, because 28621017 - 2³ = 28621009 is a prime.

It is a super-2 number, since 2×28621017² = 1638325228228578, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28621027) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19609 + ... + 21017.

It is an arithmetic number, because the mean of its divisors is an integer number (1799395).

Almost surely, 2^28621017 is an apocalyptic number.

It is an amenable number.

28621017 is a deficient number, since it is larger than the sum of its proper divisors (14564463).

28621017 is a wasteful number, since it uses less digits than its factorization.

28621017 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1513 (or 1510 counting only the distinct ones).

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

The square root of 28621017 is about 5349.8614000738. The cubic root of 28621017 is about 305.8874698362.

Adding to 28621017 its reverse (71012682), we get a palindrome (99633699).

The spelling of 28621017 in words is "twenty-eight million, six hundred twenty-one thousand, seventeen".