28307042 has 4 divisors (see below), whose sum is σ = 42460566. Its totient is φ = 14153520.

The previous prime is 28307033. The next prime is 28307047. The reversal of 28307042 is 24070382.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 27050401 + 1256641 = 5201^2 + 1121^2 .

It is not an unprimeable number, because it can be changed into a prime (28307047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7076759 + ... + 7076762.

Almost surely, 2^28307042 is an apocalyptic number.

28307042 is a deficient number, since it is larger than the sum of its proper divisors (14153524).

28307042 is a wasteful number, since it uses less digits than its factorization.

28307042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14153523.

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

The square root of 28307042 is about 5320.4362603080. The cubic root of 28307042 is about 304.7648173558.

The spelling of 28307042 in words is "twenty-eight million, three hundred seven thousand, forty-two".