28850431 has 4 divisors (see below), whose sum is σ = 28928152. Its totient is φ = 28772712.

The previous prime is 28850399. The next prime is 28850443. The reversal of 28850431 is 13405882.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28850431 - 2⁵ = 28850399 is a prime.

It is a super-2 number, since 2×28850431² = 1664694737771522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28850393 and 28850402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28850461) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38301 + ... + 39046.

It is an arithmetic number, because the mean of its divisors is an integer number (7232038).

Almost surely, 2^28850431 is an apocalyptic number.

28850431 is a deficient number, since it is larger than the sum of its proper divisors (77721).

28850431 is an equidigital number, since it uses as much as digits as its factorization.

28850431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77720.

The product of its (nonzero) digits is 7680, while the sum is 31.

The square root of 28850431 is about 5371.2597218902. The cubic root of 28850431 is about 306.7025841411.

The spelling of 28850431 in words is "twenty-eight million, eight hundred fifty thousand, four hundred thirty-one".