28130612 has 6 divisors (see below), whose sum is σ = 49228578. Its totient is φ = 14065304.

The previous prime is 28130603. The next prime is 28130647. The reversal of 28130612 is 21603182.

It can be written as a sum of positive squares in only one way, i.e., 16048036 + 12082576 = 4006^2 + 3476^2 .

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, 3516323 + ... + 3516330.

It is an arithmetic number, because the mean of its divisors is an integer number (8204763).

Almost surely, 2^28130612 is an apocalyptic number.

It is an amenable number.

28130612 is a deficient number, since it is larger than the sum of its proper divisors (21097966).

28130612 is a wasteful number, since it uses less digits than its factorization.

28130612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7032657 (or 7032655 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 28130612 is about 5303.8299369418. The cubic root of 28130612 is about 304.1303255846.

Adding to 28130612 its reverse (21603182), we get a palindrome (49733794).

The spelling of 28130612 in words is "twenty-eight million, one hundred thirty thousand, six hundred twelve".