28699434 has 60 divisors (see below), whose sum is σ = 68424774. Its totient is φ = 8989056.

The previous prime is 28699409. The next prime is 28699471. The reversal of 28699434 is 43499682.

It can be written as a sum of positive squares in 3 ways, for example, as 23011209 + 5688225 = 4797^2 + 2385^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 28699434.

It is an unprimeable number.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 46512 + ... + 47124.

Almost surely, 2^28699434 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28699434, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34212387).

28699434 is an abundant number, since it is smaller than the sum of its proper divisors (39725340).

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

28699434 is a wasteful number, since it uses less digits than its factorization.

28699434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 661 (or 635 counting only the distinct ones).

The product of its digits is 373248, while the sum is 45.

The square root of 28699434 is about 5357.1852684035. The cubic root of 28699434 is about 306.1665759719.

The spelling of 28699434 in words is "twenty-eight million, six hundred ninety-nine thousand, four hundred thirty-four".