28740442 has 4 divisors (see below), whose sum is σ = 43110666. Its totient is φ = 14370220.

The previous prime is 28740433. The next prime is 28740451. The reversal of 28740442 is 24404782.

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

It is an interprime number because it is at equal distance from previous prime (28740433) and next prime (28740451).

It can be written as a sum of positive squares in only one way, i.e., 28740321 + 121 = 5361^2 + 11^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7185109 + ... + 7185112.

Almost surely, 2^28740442 is an apocalyptic number.

28740442 is a deficient number, since it is larger than the sum of its proper divisors (14370224).

28740442 is a wasteful number, since it uses less digits than its factorization.

28740442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14370223.

The product of its (nonzero) digits is 14336, while the sum is 31.

The square root of 28740442 is about 5361.0112851961. The cubic root of 28740442 is about 306.3123315026.

The spelling of 28740442 in words is "twenty-eight million, seven hundred forty thousand, four hundred forty-two".