28700385212 has 6 divisors (see below), whose sum is σ = 50225674128. Its totient is φ = 14350192604.

The previous prime is 28700385211. The next prime is 28700385247. The reversal of 28700385212 is 21258300782.

It is a super-2 number, since 2×28700385212² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28700385211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3587548148 + ... + 3587548155.

It is an arithmetic number, because the mean of its divisors is an integer number (8370945688).

Almost surely, 2^28700385212 is an apocalyptic number.

It is an amenable number.

28700385212 is a deficient number, since it is larger than the sum of its proper divisors (21525288916).

28700385212 is a wasteful number, since it uses less digits than its factorization.

28700385212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7175096307 (or 7175096305 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 38.

Adding to 28700385212 its reverse (21258300782), we get a palindrome (49958685994).

The spelling of 28700385212 in words is "twenty-eight billion, seven hundred million, three hundred eighty-five thousand, two hundred twelve".