28057430 has 16 divisors (see below), whose sum is σ = 50564304. Its totient is φ = 11209440.

The previous prime is 28057411. The next prime is 28057439. The reversal of 28057430 is 3475082.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 28057393 and 28057402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28057439) 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, 13565 + ... + 15495.

It is an arithmetic number, because the mean of its divisors is an integer number (3160269).

Almost surely, 2^28057430 is an apocalyptic number.

28057430 is a deficient number, since it is larger than the sum of its proper divisors (22506874).

28057430 is a wasteful number, since it uses less digits than its factorization.

28057430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3391.

The product of its (nonzero) digits is 6720, while the sum is 29.

The square root of 28057430 is about 5296.9264673016. The cubic root of 28057430 is about 303.8663641050.

The spelling of 28057430 in words is "twenty-eight million, fifty-seven thousand, four hundred thirty".