28772426 has 4 divisors (see below), whose sum is σ = 43158642. Its totient is φ = 14386212.

The previous prime is 28772389. The next prime is 28772453. The reversal of 28772426 is 62427782.

It is a happy number.

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., 28569025 + 203401 = 5345^2 + 451^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 28772426.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7193105 + ... + 7193108.

Almost surely, 2^28772426 is an apocalyptic number.

28772426 is a deficient number, since it is larger than the sum of its proper divisors (14386216).

28772426 is a wasteful number, since it uses less digits than its factorization.

28772426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14386215.

The product of its digits is 75264, while the sum is 38.

The square root of 28772426 is about 5363.9934750147. The cubic root of 28772426 is about 306.4259166452.

The spelling of 28772426 in words is "twenty-eight million, seven hundred seventy-two thousand, four hundred twenty-six".