28646394 has 64 divisors (see below), whose sum is σ = 70730496. Its totient is φ = 7547904.

The previous prime is 28646389. The next prime is 28646407. The reversal of 28646394 is 49364682.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 37464 + ... + 38220.

It is an arithmetic number, because the mean of its divisors is an integer number (1105164).

Almost surely, 2^28646394 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28646394, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35365248).

28646394 is an abundant number, since it is smaller than the sum of its proper divisors (42084102).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28646394 is a wasteful number, since it uses less digits than its factorization.

28646394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 839.

The product of its digits is 248832, while the sum is 42.

The square root of 28646394 is about 5352.2326182631. The cubic root of 28646394 is about 305.9778487959.

The spelling of 28646394 in words is "twenty-eight million, six hundred forty-six thousand, three hundred ninety-four".