28000371 has 16 divisors (see below), whose sum is σ = 42742784. Its totient is φ = 15971904.

The previous prime is 28000367. The next prime is 28000381. The reversal of 28000371 is 17300082.

It is not a de Polignac number, because 28000371 - 2² = 28000367 is a prime.

It is a super-2 number, since 2×28000371² = 1568041552275282, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (28000321) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18966 + ... + 20388.

It is an arithmetic number, because the mean of its divisors is an integer number (2671424).

Almost surely, 2^28000371 is an apocalyptic number.

28000371 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

28000371 is a deficient number, since it is larger than the sum of its proper divisors (14742413).

28000371 is a wasteful number, since it uses less digits than its factorization.

28000371 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2370.

The product of its (nonzero) digits is 336, while the sum is 21.

The square root of 28000371 is about 5291.5376782179. The cubic root of 28000371 is about 303.6602383418.

The spelling of 28000371 in words is "twenty-eight million, three hundred seventy-one", and thus it is an aban number.