28177972 has 6 divisors (see below), whose sum is σ = 49311458. Its totient is φ = 14088984.

The previous prime is 28177949. The next prime is 28177991. The reversal of 28177972 is 27977182.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 28153636 + 24336 = 5306^2 + 156^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3522243 + ... + 3522250.

Almost surely, 2^28177972 is an apocalyptic number.

It is an amenable number.

28177972 is a deficient number, since it is larger than the sum of its proper divisors (21133486).

28177972 is a wasteful number, since it uses less digits than its factorization.

28177972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7044497 (or 7044495 counting only the distinct ones).

The product of its digits is 98784, while the sum is 43.

The square root of 28177972 is about 5308.2927575634. The cubic root of 28177972 is about 304.3009053144.

The spelling of 28177972 in words is "twenty-eight million, one hundred seventy-seven thousand, nine hundred seventy-two".