28161634 has 12 divisors (see below), whose sum is σ = 42737346. Its totient is φ = 13916672.

The previous prime is 28161631. The next prime is 28161649. The reversal of 28161634 is 43616182.

28161634 = T₁₀₂ + T₁₀₃ + ... + T₅₅₃.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 13300609 + 14861025 = 3647^2 + 3855^2 .

It is a junction number, because it is equal to n+sod(n) for n = 28161596 and 28161605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28161631) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 79602 + ... + 79954.

Almost surely, 2^28161634 is an apocalyptic number.

28161634 is a deficient number, since it is larger than the sum of its proper divisors (14575712).

28161634 is an equidigital number, since it uses as much as digits as its factorization.

28161634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 821 (or 468 counting only the distinct ones).

The product of its digits is 6912, while the sum is 31.

The square root of 28161634 is about 5306.7536215656. The cubic root of 28161634 is about 304.2420812398.

The spelling of 28161634 in words is "twenty-eight million, one hundred sixty-one thousand, six hundred thirty-four".