28420371 has 24 divisors (see below), whose sum is σ = 49387520. Its totient is φ = 15384816.

The previous prime is 28420369. The next prime is 28420411. The reversal of 28420371 is 17302482.

It is not a de Polignac number, because 28420371 - 2¹ = 28420369 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28420471) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10675 + ... + 13068.

Almost surely, 2^28420371 is an apocalyptic number.

28420371 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

28420371 is a deficient number, since it is larger than the sum of its proper divisors (20967149).

28420371 is a wasteful number, since it uses less digits than its factorization.

28420371 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23775 (or 23772 counting only the distinct ones).

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

The square root of 28420371 is about 5331.0759701959. The cubic root of 28420371 is about 305.1709907458.

The spelling of 28420371 in words is "twenty-eight million, four hundred twenty thousand, three hundred seventy-one".