28438670212 has 12 divisors (see below), whose sum is σ = 49829196060. Its totient is φ = 14201757056.

The previous prime is 28438670207. The next prime is 28438670219. The reversal of 28438670212 is 21207683482.

It can be written as a sum of positive squares in 2 ways, for example, as 24129272896 + 4309397316 = 155336^2 + 65646^2 .

It is a super-2 number, since 2×28438670212² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28438670219) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4390873 + ... + 4397344.

It is an arithmetic number, because the mean of its divisors is an integer number (4152433005).

Almost surely, 2^28438670212 is an apocalyptic number.

It is an amenable number.

28438670212 is a deficient number, since it is larger than the sum of its proper divisors (21390525848).

28438670212 is a wasteful number, since it uses less digits than its factorization.

28438670212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8789030 (or 8789028 counting only the distinct ones).

The product of its (nonzero) digits is 258048, while the sum is 43.

The spelling of 28438670212 in words is "twenty-eight billion, four hundred thirty-eight million, six hundred seventy thousand, two hundred twelve".