28151946 has 24 divisors (see below), whose sum is σ = 61684740. Its totient is φ = 9278016.

The previous prime is 28151941. The next prime is 28151947. The reversal of 28151946 is 64915182.

It can be written as a sum of positive squares in 2 ways, for example, as 28037025 + 114921 = 5295^2 + 339^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 28151946.

It is not an unprimeable number, because it can be changed into a prime (28151941) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 7185 + ... + 10388.

Almost surely, 2^28151946 is an apocalyptic number.

28151946 is an abundant number, since it is smaller than the sum of its proper divisors (33532794).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28151946 is a wasteful number, since it uses less digits than its factorization.

28151946 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17670 (or 17667 counting only the distinct ones).

The product of its digits is 17280, while the sum is 36.

The square root of 28151946 is about 5305.8407439349. The cubic root of 28151946 is about 304.2071893802.

It can be divided in two parts, 2815 and 1946, that added together give a square (4761 = 69²).

The spelling of 28151946 in words is "twenty-eight million, one hundred fifty-one thousand, nine hundred forty-six".