28147772 has 24 divisors (see below), whose sum is σ = 50448384. Its totient is φ = 13738032.

The previous prime is 28147753. The next prime is 28147781. The reversal of 28147772 is 27774182.

It is a happy number.

It is a congruent number.

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 in 7 ways as a sum of consecutive naturals, for example, 33623 + ... + 34449.

It is an arithmetic number, because the mean of its divisors is an integer number (2102016).

Almost surely, 2^28147772 is an apocalyptic number.

It is an amenable number.

28147772 is a deficient number, since it is larger than the sum of its proper divisors (22300612).

28147772 is a wasteful number, since it uses less digits than its factorization.

28147772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1025 (or 1023 counting only the distinct ones).

The product of its digits is 43904, while the sum is 38.

The square root of 28147772 is about 5305.4473892406. The cubic root of 28147772 is about 304.1921540245.

The spelling of 28147772 in words is "twenty-eight million, one hundred forty-seven thousand, seven hundred seventy-two".