28840431 has 8 divisors (see below), whose sum is σ = 38518704. Its totient is φ = 19194560.

The previous prime is 28840417. The next prime is 28840463. The reversal of 28840431 is 13404882.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28840431 - 2⁹ = 28839919 is a prime.

It is a super-2 number, since 2×28840431² = 1663540920531522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28840411) 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, 5940 + ... + 9641.

It is an arithmetic number, because the mean of its divisors is an integer number (4814838).

Almost surely, 2^28840431 is an apocalyptic number.

28840431 is a deficient number, since it is larger than the sum of its proper divisors (9678273).

28840431 is a wasteful number, since it uses less digits than its factorization.

28840431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16201.

The product of its (nonzero) digits is 6144, while the sum is 30.

The square root of 28840431 is about 5370.3287608861. The cubic root of 28840431 is about 306.6671441129.

The spelling of 28840431 in words is "twenty-eight million, eight hundred forty thousand, four hundred thirty-one".