28437200638 has 32 divisors (see below), whose sum is σ = 53217451008. Its totient is φ = 11071888800.

The previous prime is 28437200633. The next prime is 28437200723. The reversal of 28437200638 is 83600273482.

It is a junction number, because it is equal to n+sod(n) for n = 28437200594 and 28437200603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28437200633) 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, 166908 + ... + 291088.

It is an arithmetic number, because the mean of its divisors is an integer number (1663045344).

Almost surely, 2^28437200638 is an apocalyptic number.

28437200638 is a deficient number, since it is larger than the sum of its proper divisors (24780250370).

28437200638 is a wasteful number, since it uses less digits than its factorization.

28437200638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125688.

The product of its (nonzero) digits is 387072, while the sum is 43.

The spelling of 28437200638 in words is "twenty-eight billion, four hundred thirty-seven million, two hundred thousand, six hundred thirty-eight".