28690434 has 24 divisors (see below), whose sum is σ = 62615280. Its totient is φ = 9493848.

The previous prime is 28690423. The next prime is 28690439. The reversal of 28690434 is 43409682.

It is a happy number.

It is a super-4 number, since 4×28690434⁴ (a number of 31 digits) contains 4444 as substring.

It is not an unprimeable number, because it can be changed into a prime (28690439) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3232 + ... + 8235.

It is an arithmetic number, because the mean of its divisors is an integer number (2608970).

Almost surely, 2^28690434 is an apocalyptic number.

28690434 is an abundant number, since it is smaller than the sum of its proper divisors (33924846).

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

28690434 is a wasteful number, since it uses less digits than its factorization.

28690434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11614 (or 11611 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 36.

The square root of 28690434 is about 5356.3452091888. The cubic root of 28690434 is about 306.1345685199.

The spelling of 28690434 in words is "twenty-eight million, six hundred ninety thousand, four hundred thirty-four".