28356442 has 8 divisors (see below), whose sum is σ = 45036756. Its totient is φ = 13344192.

The previous prime is 28356437. The next prime is 28356481. The reversal of 28356442 is 24465382.

It can be written as a sum of positive squares in 2 ways, for example, as 27867841 + 488601 = 5279^2 + 699^2 .

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

It is a Harshad number since it is a multiple of its sum of digits (34), and also a Moran number because the ratio is a prime number: 834013 = 28356442 / (2 + 8 + 3 + 5 + 6 + 4 + 4 + 2).

It is a junction number, because it is equal to n+sod(n) for n = 28356398 and 28356407.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 416973 + ... + 417040.

Almost surely, 2^28356442 is an apocalyptic number.

28356442 is a deficient number, since it is larger than the sum of its proper divisors (16680314).

28356442 is a wasteful number, since it uses less digits than its factorization.

28356442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 834032.

The product of its digits is 46080, while the sum is 34.

The square root of 28356442 is about 5325.0767130625. The cubic root of 28356442 is about 304.9420009755.

The spelling of 28356442 in words is "twenty-eight million, three hundred fifty-six thousand, four hundred forty-two".