28261012 has 24 divisors (see below), whose sum is σ = 53798472. Its totient is φ = 12912000.

The previous prime is 28261003. The next prime is 28261027. The reversal of 28261012 is 21016282.

It can be written as a sum of positive squares in 4 ways, for example, as 4309776 + 23951236 = 2076^2 + 4894^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2562 + ... + 7942.

It is an arithmetic number, because the mean of its divisors is an integer number (2241603).

Almost surely, 2^28261012 is an apocalyptic number.

It is an amenable number.

28261012 is a deficient number, since it is larger than the sum of its proper divisors (25537460).

28261012 is a wasteful number, since it uses less digits than its factorization.

28261012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5499 (or 5497 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 22.

The square root of 28261012 is about 5316.1087272553. The cubic root of 28261012 is about 304.5995353360.

Adding to 28261012 its reverse (21016282), we get a palindrome (49277294).

The spelling of 28261012 in words is "twenty-eight million, two hundred sixty-one thousand, twelve".