28031427 has 20 divisors (see below), whose sum is σ = 42061536. Its totient is φ = 18604080.

The previous prime is 28031417. The next prime is 28031447. The reversal of 28031427 is 72413082.

It is not a de Polignac number, because 28031427 - 2¹⁰ = 28030403 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 28031427.

It is not an unprimeable number, because it can be changed into a prime (28031407) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 21313 + ... + 22589.

Almost surely, 2^28031427 is an apocalyptic number.

28031427 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

28031427 is a deficient number, since it is larger than the sum of its proper divisors (14030109).

28031427 is a wasteful number, since it uses less digits than its factorization.

28031427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1560 (or 1551 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 28031427 is about 5294.4713617131. The cubic root of 28031427 is about 303.7724629021.

The spelling of 28031427 in words is "twenty-eight million, thirty-one thousand, four hundred twenty-seven".