28437772788 has 48 divisors (see below), whose sum is σ = 78064479360. Its totient is φ = 8921653632.

The previous prime is 28437772787. The next prime is 28437772799. The reversal of 28437772788 is 88727773482.

It is a super-2 number, since 2×28437772788² (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 (28437772787) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7742656 + ... + 7746327.

It is an arithmetic number, because the mean of its divisors is an integer number (1626343320).

Almost surely, 2^28437772788 is an apocalyptic number.

It is an amenable number.

28437772788 is an abundant number, since it is smaller than the sum of its proper divisors (49626706572).

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

28437772788 is a wasteful number, since it uses less digits than its factorization.

28437772788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15489013 (or 15489005 counting only the distinct ones).

The product of its digits is 59006976, while the sum is 63.

The spelling of 28437772788 in words is "twenty-eight billion, four hundred thirty-seven million, seven hundred seventy-two thousand, seven hundred eighty-eight".