28277424 has 120 divisors (see below), whose sum is σ = 93882880. Its totient is φ = 8071488.

The previous prime is 28277393. The next prime is 28277429. The reversal of 28277424 is 42477282.

It is a super-2 number, since 2×28277424² = 1599225416151552, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (28277429) 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, 26697 + ... + 27735.

Almost surely, 2^28277424 is an apocalyptic number.

28277424 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28277424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (46941440).

28277424 is an abundant number, since it is smaller than the sum of its proper divisors (65605456).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28277424 is a wasteful number, since it uses less digits than its factorization.

28277424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1069 (or 1051 counting only the distinct ones).

The product of its digits is 50176, while the sum is 36.

The square root of 28277424 is about 5317.6521134802. The cubic root of 28277424 is about 304.6584872256.

The spelling of 28277424 in words is "twenty-eight million, two hundred seventy-seven thousand, four hundred twenty-four".