28855561437 has 6 divisors (see below), whose sum is σ = 41680255422. Its totient is φ = 19237040952.

The previous prime is 28855561417. The next prime is 28855561477. The reversal of 28855561437 is 73416555882.

28855561437 is a `hidden beast` number, since 2 + 8 + 85 + 556 + 1 + 4 + 3 + 7 = 666.

It can be written as a sum of positive squares in only one way, i.e., 25816134276 + 3039427161 = 160674^2 + 55131^2 .

It is not a de Polignac number, because 28855561437 - 2⁶ = 28855561373 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28855561417) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1603086738 + ... + 1603086755.

It is an arithmetic number, because the mean of its divisors is an integer number (6946709237).

Almost surely, 2^28855561437 is an apocalyptic number.

It is an amenable number.

28855561437 is a deficient number, since it is larger than the sum of its proper divisors (12824693985).

28855561437 is a wasteful number, since it uses less digits than its factorization.

28855561437 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3206173499 (or 3206173496 counting only the distinct ones).

The product of its digits is 8064000, while the sum is 54.

The spelling of 28855561437 in words is "twenty-eight billion, eight hundred fifty-five million, five hundred sixty-one thousand, four hundred thirty-seven".