28072430 has 16 divisors (see below), whose sum is σ = 50639904. Its totient is φ = 11204640.

The previous prime is 28072417. The next prime is 28072433. The reversal of 28072430 is 3427082.

It is a super-2 number, since 2×28072430² = 1576122652209800, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 28072430.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28072433) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2240 + ... + 7820.

It is an arithmetic number, because the mean of its divisors is an integer number (3164994).

Almost surely, 2^28072430 is an apocalyptic number.

28072430 is a deficient number, since it is larger than the sum of its proper divisors (22567474).

28072430 is a wasteful number, since it uses less digits than its factorization.

28072430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6091.

The product of its (nonzero) digits is 2688, while the sum is 26.

The square root of 28072430 is about 5298.3421935545. The cubic root of 28072430 is about 303.9205052415.

The spelling of 28072430 in words is "twenty-eight million, seventy-two thousand, four hundred thirty".