28427290 has 8 divisors (see below), whose sum is σ = 51169140. Its totient is φ = 11370912.

The previous prime is 28427261. The next prime is 28427293. The reversal of 28427290 is 9272482.

It can be written as a sum of positive squares in 2 ways, for example, as 27008809 + 1418481 = 5197^2 + 1191^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×28427290² = 1616221633488200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28427293) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1421355 + ... + 1421374.

Almost surely, 2^28427290 is an apocalyptic number.

28427290 is a deficient number, since it is larger than the sum of its proper divisors (22741850).

28427290 is a wasteful number, since it uses less digits than its factorization.

28427290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2842736.

The product of its (nonzero) digits is 16128, while the sum is 34.

The square root of 28427290 is about 5331.7248616184. The cubic root of 28427290 is about 305.1957535795.

It can be divided in two parts, 28427 and 290, that multiplied together give a triangular number (8243830 = T₄₀₆₀).

The spelling of 28427290 in words is "twenty-eight million, four hundred twenty-seven thousand, two hundred ninety".