28970639838 has 48 divisors (see below), whose sum is σ = 73090364256. Its totient is φ = 8121147840.

The previous prime is 28970639833. The next prime is 28970639843. The reversal of 28970639838 is 83893607982.

It is an interprime number because it is at equal distance from previous prime (28970639833) and next prime (28970639843).

It is a super-2 number, since 2×28970639838² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28970639833) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2162433 + ... + 2175788.

It is an arithmetic number, because the mean of its divisors is an integer number (1522715922).

Almost surely, 2^28970639838 is an apocalyptic number.

28970639838 is an abundant number, since it is smaller than the sum of its proper divisors (44119724418).

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

28970639838 is a wasteful number, since it uses less digits than its factorization.

28970639838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4338289 (or 4338286 counting only the distinct ones).

The product of its (nonzero) digits is 31352832, while the sum is 63.

The spelling of 28970639838 in words is "twenty-eight billion, nine hundred seventy million, six hundred thirty-nine thousand, eight hundred thirty-eight".