28377231 has 4 divisors (see below), whose sum is σ = 37836312. Its totient is φ = 18918152.

The previous prime is 28377229. The next prime is 28377257. The reversal of 28377231 is 13277382.

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 28377231 - 2¹ = 28377229 is a prime.

It is a super-2 number, since 2×28377231² = 1610534478454722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28377192 and 28377201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28377211) 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, 4729536 + ... + 4729541.

It is an arithmetic number, because the mean of its divisors is an integer number (9459078).

Almost surely, 2^28377231 is an apocalyptic number.

28377231 is a deficient number, since it is larger than the sum of its proper divisors (9459081).

28377231 is an equidigital number, since it uses as much as digits as its factorization.

28377231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9459080.

The product of its digits is 14112, while the sum is 33.

The square root of 28377231 is about 5327.0283460856. The cubic root of 28377231 is about 305.0165036308.

The spelling of 28377231 in words is "twenty-eight million, three hundred seventy-seven thousand, two hundred thirty-one".