28621161 has 8 divisors (see below), whose sum is σ = 42401760. Its totient is φ = 19080756.

The previous prime is 28621121. The next prime is 28621169. The reversal of 28621161 is 16112682.

28621161 is a `hidden beast` number, since 28 + 621 + 16 + 1 = 666.

It is not a de Polignac number, because 28621161 - 2⁶ = 28621097 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 1060043 = 28621161 / (2 + 8 + 6 + 2 + 1 + 1 + 6 + 1).

It is not an unprimeable number, because it can be changed into a prime (28621169) 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, 529995 + ... + 530048.

It is an arithmetic number, because the mean of its divisors is an integer number (5300220).

Almost surely, 2^28621161 is an apocalyptic number.

It is an amenable number.

28621161 is a deficient number, since it is larger than the sum of its proper divisors (13780599).

28621161 is a wasteful number, since it uses less digits than its factorization.

28621161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1060052 (or 1060046 counting only the distinct ones).

The product of its digits is 1152, while the sum is 27.

The square root of 28621161 is about 5349.8748583495. The cubic root of 28621161 is about 305.8879828360.

It can be divided in two parts, 28621 and 161, that added together give a palindrome (28782).

The spelling of 28621161 in words is "twenty-eight million, six hundred twenty-one thousand, one hundred sixty-one".